Continuity mistake: In Season 2 Episode 22, Model Behavior, Woody has gotten his braces off. However, in this episode, he has braces back on again.
Continuity mistake: All the castle windows on the outside of the castle are small squares yet from inside the rooms they're arched.
Triumvirate of Terror! - S3-E8
Continuity mistake: After the opening title sequence, it shows Batman and a reporter tied to a giant bullseye target. She and Batman are equal distance from the center bullseye, and it is about waist level on her. It then cuts to a perspective from Batman's angle, and suddenly the reporter is much closer to the center, and the bullseye is level with her calves. Then when the giant pie is flying towards them, the center bullseye is level with her and Batman's feet. (00:05:05)
Six-Can Solution/Silence of the Sheep - S4-E21
Continuity mistake: In "The Six Can Solution" Odie steals 6 cans, then when he gets to the girl's house there are 12 cans in his red wagon when the camera zeros in on Squeak. (00:10:10 - 00:11:30)