Continuity mistake: In the scene where Scarlett is talking to Ashley about owing the carpet bagger 300 dollars right before Ashley kisses her you can see a definite change. Ashley has different dirt on his face and Scarlett's dress looks lighter. Her hair is also loose in different places.
Continuity mistake: When the stagecoach enters Tonto street, it's shadow switches sides between angles.
Continuity mistake: When the Master of Ceremonies appears on stage at the start of the show, a spotlight shines on him and you can see his shadow on the curtain behind him. But in the next shot, there is no shadow.
Continuity mistake: During the Blue Birds in the Moonlight song you can see Gulliver holding his drink. In the next shot while he's laughing the drink has disappeared.