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: Cheetah slams Superman into what looks like a computer mainframe. He stumbles forward and falls to his knees. The next shot as Cheetah kicks him, he is suddenly standing again and in the middle of the room, away from the mainframe. (00:12:55)
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)