Character mistake: When Dean Martin desribes his writer's block to Judy Holiday, she says that she keeps sharpening his Ticonderoga pencil until there's nothing left but the "Ti," but in fact what would be left on a little nib is the "ga."
Character mistake: At the very end of the movie, Jack Lemmon begins dealing cards for the gin rummy, but he deals about 14 cards before the fade to black, in a 10 cards game. (01:59:45)