When the flag pole falls over on top of the hotel, the flag unfurls, but in the next shot, it is still wrapped around the mast.
When the two bellhops are unloading luggage from the taxi, the sidewalk in the background wasn't blocked off to non-crew. As a result, you can watch bystanders wander up and gather in small groups to watch the movie being filmed, or realize a movie is being made on the sidewalk and duck into doorways.