Gone with the Wind (1939)

Continuity mistake: In the scene where Gerald gets on his horse to chase after Jonas Wilkerson, Suellen and Carreen run outside to see what is going on. The door is left open when they come out, but in the next shot that shows Scarlett yelling for Gerald to come back, Suellen and Carreen are no longer outside and the door is closed.

Continuity mistake: When the Tarleton twins are flirting with Scarlett they're both holding glasses in their hands. When they all leave after a close-up shot on their faces there's no trace of a glass, neither in any hand or anywhere on the ground. (00:07:55)