Yeah. Also, if you run out of the dining room back to Barry when you first see the zombie he will shoot it for you. It saves on the ammo lol.

I did things differently sometimes.. met barry in two different places when he gives you the bazooka ammo, and sometimes he didn't save me when i tried getting the shotgun the easy way. think you can do so you don't meet him at the balcony, aswell. it's all how you explore the mansion and trigger cutscenes, methinks. had no clue about waiting in the dining room tho.. i always did hate meeting that first zombie, and ran to barry to take care of 'im. then got the ammo ;D

Is the extra Wesker scene the one where he tells Jill/Chris he's counting on them to investigate that gunfire ?

Yes, there is a lot of situations like that one in this game, where you can see alternate cutscenes. It all depends on how you play.

If you try leaving a couple of times to go back to the main hall while you're in the dining room, Barry chides you. Also, after the zombie busts in, you are sort of penalized for being a chicken because when you finally investigate Kenneth, you see that the zombie has eaten more of him (there's actually LESS of a corpse there, if I recall), and the ammo clips are gone!!!

Yep it's interesting all right. I wonder if there are more scenes like this in the game
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Wow I never knew that either. I just replayed the beginning and you're right. Interesting.
"You're a woman, Harry"