Continuity mistake: When Dr. Meade announces General Lee's victory (and later Rhett Butler as a special guest) at the "Monster Bazaar", he speaks to a backdrop showing the audience with a soldier with a drum standing left to him. Behind him, a couple in black is dancing. When he moves, Rhett and Scarlett are revealed, going to the rear of the dance floor. Clearly they haven't met at that point, as they are introduced by Melanie moments later.
Continuity mistake: When the stagecoach enters Tonto street, it's shadow switches sides between angles.
Continuity mistake: Cathy and Heathcliff run away from two dogs as they spy on the party and Heathcliff helps her up the wall. In the next shot he is already on the wall and jumps down.
Continuity mistake: When Jefferson Smith goes to talk to Senator Paine he fumbles with his hat when he meets Susan. As he bumps into the table on his way out his hat disappears.
Continuity mistake: Gloria (Eve Arden) caps her bitter statement by plucking something to eat with her fingers. As Anita's gramps arrives, she is eating off her plate with silverware. (00:03:25)