As Uncle Billy is leaving George’s house drunk, it sounds as if he stumbles over some trash cans on the sidewalk. In fact, a crew member dropped some equipment right after Uncle Billy left the screen.
It’s A Wonderful Life (1946)
The entire picture was shot on one set, which required months of planning and construction. The apartment-courtyard set measured 98 feet wide, 185 feet long and 40 feet high, and consisted of 31 apartments, eight of which were completely furnished.