Because nothing would have come of it. Just more work for the make-up artist. Recall the bad dude getting shot in the face and being left for dead and then a minute later he gains the strength of the Hulk.

Here's a plot hole. The driver said he's been trafficking girls for 5 years, right?
You mean to tell me that, in all 5 of those years, none of the girls' friends and family members have done any massive investigating? Or even hired someone to investigate? I mean, if they checked the airport's flight records, they would see that their friend/daughter arrived safely and therefore, disappeared sometime after the plane landed, which was at around 2AM. And if the parents or friends of all of the trafficked girls were super concerned, they would see this pattern, since it's been happening for 5 years, and would have the police or somebody do late night investigating at the airport, and would eventually find out what the driver has been doing. I don't know, it's just something I thought of.
If the driver were to get caught, he would probably give up that drawer of IDs, and he would even say where he shipped the girls off to, but it would probably be too late to locate every single one of them.

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It's called a plot hole.

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They talk like this because most of the time they're defending a movie they like. Granted it's not right and people could act a heck of alot more civil, but that's the reason.
Peace is not the absence of affliction, but the presence of God. ~Author Unknown

Why do people have to call each other moron and tool and idiot over nothing? Get over it, it's just a stupid movie. Easy to act tough behind a computer screen.

You don't need to be offensive (generally a sign that you are losing the argument).
Go and read the definition again:
"unlikely behaviour or actions of characters"
They had a perfect oportunity to knock the driver out, yet they did not. This is unlikely behaviour.

And Moron that is not a plot hole but rather something you think they should have done that they did not. A good example is from one of the Star Wars movies.
When Amidala and some of the clone troopers get blown out of the ship chasing Dooku, later the trooper approaches Amidala and asks about making their way back to the front lines, but Amidala says they should go to the hangar to help Obi-Wan and Ani. How did she know about the hangar, having left the ship quite some time before it arrived at the final destination?
This is something that could not have happened because of the "hole".
You defined the term plot hole and still don't even realize what you said wasn't one. What a tool.

Allow me to quote:
"A plot hole, or plothole, is a gap or inconsistency in a storyline that goes against the flow of logic established by the story's plot, or constitutes a blatant omission of relevant information regarding the plot. These include such things as unlikely behaviour or actions of characters, illogical or impossible events, events happening for no apparent reason, or statements/events that contradict earlier events in the storyline."
Ok, so now we have that straight, go back and watch the film!

Please learn What a plot hole is.

The funny thing about your complaint is that it's realism based, yet, reality shows that real people sometimes are oblivious to obvious solutions. It's not as if a scenario in reality couldn't exist where people weren't aware of what you felt was an obvious solution.

Well HispterSealOfApproval it is not merely "a character acting the way I think they should have." It is indeed a plot hole as it requires the viewer to have to sidestep/conveniently ignore a rather obvious solution to their predicament merely in order to prolong the story.
For other plot holes see whatwazdat's post

So a character not acting the way you think they should have is a plot hole?
Geez, it seems like no one has a clue what a plot hole is these days.

You are correct, number 1 and 2 are not plot holes for the reasons you stated.
However, regarding your other point: "The only major plot hole I saw was them not bum rushing the driver, like you said. They should've knocked him out cold and threw him off the bus. It doesn't matter if Andy was a mole, he didn't have any weapons on him. And besides, it would've been 4 to 1, he wouldn't have been able to win."
This is NOT a plot hole either for two simple facts: (1) the Driver had a GUN.
It's easy to talk brave from the couch in front of the TV, but the reality is that the Driver would shoot and likely kill at least one of them. So the whole idea of bum rushing the Driver early on, after it became clear they were being kidnapped, is a suicide mission.
Particularly in light of the fact that the passengers ultimate demise/death early on was in no way assured (i.e., they weren't on a plane that had been hijacked by terrorists and knew with relative certainly their deaths were imminent). All they knew for certain was those who acted up or got out of line (i.e., the incident with the flare, or the fire at the ATM) got "punished." So a suicide mission would seem an overly risky response.
And, (2) moreover, by the time the first person died (the kid who took off running at the grocery store), and it became absolutely clear thier lives were in grave danger, from there on, ALL THE PASSENGERS WERE LOCKED INTO THEIR SEATS BY LOCKING SEATBELTS, so even if they wanted to "bum rush" the Driver, who, again, had a gun, they couldn't.
The thing you have missed is the incremental nature of their dilemma, how it became progressively worse and by the time it was clear that a suicide mission/bum rush was called for, it was too late.

Numbers 1 and 2 aren't plot holes. They were driving away from downtown through unfamilliar terrain at 2:30 AM, so I don't think there would be that many people awake and driving. And the driver had the supplies in the back of the bus in that box, but when they set the flare off and threw it in the back, it got in the box and burned most of them, so he had Mel re-buy the items.
The only major plot hole I saw was them not bum rushing the driver, like you said. They should've knocked him out cold and threw him off the bus. It doesn't matter if Andy was a mole, he didn't have any weapons on him. And besides, it would've been 4 to 1, he wouldn't have been able to win.

But if you want plot holes:

1. Apparently nobody lives in Downtown. You can drive recklessly, burn atm machines, run over people, dump bodies.. all in a conspicuous mini bus.
2. What was the point in allowing Mel to go into the supermarket when he could have bought the "travel" supplies beforehand and not risk anything?
3. What was the point in clearing out the atm's when he's making 40k a month in this business?
4. What was the point in getting the guys to loot the suitcases? Once again, when he's making 40k a month? They act like petty thieves during the movie, then at the end, it is revealed that 40k wouldn't even buy the girls freedom because he makes 40k a mont
   None of those are plot holes, either. They're just examples of what this particular
   fictional
   world was like and how these particular
   fictional
   characters behaved. That you're hung up on the fact that you don't think those things match what the actual world is like isn't a plot hole or a shortcoming of the film, it's rather a shortcoming in your understanding of what fiction is.
   But what makes your complaints even more bizarre, is that they happen to be about things that could happen in the actual world. It's not like we're talking about inexplicable acts of sorcery here or something. There are some towns where things pretty much shut down after dark, there are some people who are greedy enough to take a few hundred bucks even though they already have a lot of money, etc. so you're listing those things as plot holes suggest that not only do you not have a very good grasp of what fiction is, but you also may not have a very good grasp of what the actual world is like.

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robbing them of the ATM might have been used as a tactic to get them to think he just wanted their money and then they'd be let free.

Yes, she should have thought of that. Actually the group should have thought about bum rushing the driver. Collectively, bum rushing was what they should have thought about. But are you forgetting that one of the passengers was a mole? So in this alternate reality in which she tries to bash the driver with the tire iron, you would have to assume his partner would have spoiled it. So it's actually moot what they should or should not have planned. But they should have thought about bum rushing. That wouldn't have worked out either because the partner would have revealed himself by stabbing one of them or something. But the point is they didn't know there was a mole, so it's unbelievable they didn't even think about bum rushing.
But if you want plot holes:

1. Apparently nobody lives in Downtown. You can drive recklessly, burn atm machines, run over people, dump bodies.. all in a conspicuous mini bus.
2. What was the point in allowing Mel to go into the supermarket when he could have bought the "travel" supplies beforehand and not risk anything?
3. What was the point in clearing out the atm's when he's making 40k a month in this business?
4. What was the point in getting the guys to loot the suitcases? Once again, when he's making 40k a month? They act like petty thieves during the movie, then at the end, it is revealed that 40k wouldn't even buy the girls freedom because he makes 40k a month.