Didn't the cop come in and say he was gonna make a ferderal case of what happened, I took that as all the gangsters were gonna be arrested and Curtis and Lemmon will be ok

The ending is simply perfect.

You've seen too many trashy soaps and cheap romcoms. This is a REAL comedy, and the ending is perfect.

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Well life happens pretty ambiguously and so should a good movie. Always leave them wanting more.
Karina Licursi ~

A line not ending with "Well, nobody's perfect!" would be not as good of an ending. That line is just perfect. I can't see it end any other way. Also you can't ask for better ending to a comedy movie than that line.
That line was funniest part of the movie imo.

For heaven's sake, it's a farce, not Eugene ONeill. Don't spoil it by overthinking it. The ending is perfect - completely unexpected, and leaving the audience both laughing and scratching their heads in bafflement.

The ending was perfect for me. In those days cinemas had stage curtains. The curtain was closing when this punchline was delivered. The audience was laughing as the lights came up. These days we have 7 minutes of credits, most of which are not required. All this info can be got on line.

The ending was just fine.

The gangsters are all arrested for the murder of Spats, or if they aren't, they probably have bigger fish to fry than two witnesses who never came forward anyway. And if they are leaving for South America Heck, if they just stay out of Chicago, they could probably stick to their real names. That the gangsters found them at all the first time were just dumb luck, that they stayed at the same hotel.

Right after Spats and his gang were rubbed out, the police chief (played by Pat O'Brien) arrived on the scene to arrest "Little Napoleon" and his crew.
I'm sure he had men searching the grounds of the hotel for the gangsters chasing Joe and Jerry.
Then, in a day or two, they would have read in the paper that all the bad guys were in custody and they were safe.
Of course, they might have been called to testify, which would have been a waste of time, since they didn't actually see Spats and his gang being gunned down.

Please, I implore you to explain. Tell me how the gangster plot point was resolved. Lend me your infinite wisdom.
Ram this in your clambake, bitchcakes!

The ending resolved everything. If you don't see that then you should rewatch the film.
"What she asked of me at the end of the day, Caligula would have blushed." - Morrissey

I agree, I wasn't expecting it to end there and so abruptly. It was like the director died before they got the chance to finish it, so they decided to end it on a joke.

Gee! That thrilling ending would really have added to my enjoyment of the filmNOT!
I bet you're the type of koala whose bed is perfectly made each day, without a crease, before leaving to watch films whilst chewing eucalyptus leaves.

The ending of the film is them literally being chased by the gangsters, how is that a resolved plot point? Gerald and Joe were witnesses to two separate mob murders, there's no basis to assume that they'd just give up chasing them just because the credits roll.
How would I resolve it? The gangsters chase them to the pier, then the police arrive and arrest them. Oh wait, I was wrong. That'd only take 30 seconds to do. You wouldn't have to change a single action or piece of dialogue on the speedboat and the story is wrapped up.
"Ram this in your clambake, bitchcakes!"

It would have taken two minutes to wrap up the gangster plot
Oh yeah! How would you resolve it in 2 minutes?
It was pretty much resolved any way.
The guys who were behind the St Valentine's Day massacre were taken care of and it's unlikely the other guys are going to travel the length and breadth of the country chasing Joe and Jerry who we know aren't going to go to the police.

It would have taken two minutes to wrap up the gangster plot, which is kind of a big thing to leave open. I hated that they left that open without resolving it.
"Ram this in your clambake, bitchcakes!"

I thought it was good and the famous final line is a beauty. We really didn't need to know any thing more. The film was already 2 hours long, quite lengthy for a comedy, especially around that time.