Side Conversations...
This movie is entertaining because it fills every basic requirement (logic has never been a requirement).
But the parts of the movie that brings me the most chuckles are the side conversations with completely unknown characters? For instance the two guys moving the artwork at the museum and the one who goes all philosophical. And then there's the two old fire captains who are arguing over San Diego and San Francisco being completely but colorfully put as unimportant compared to Los Angeles. I'm sure there are other examples, but these two are the ones I best remember.