Continuity mistake: When Cruella (Glenn Close) gets turned into a cake, the dogs squirt coloured icing all over her face. A few seconds later she falls against a glass door with her face, and red icing is smeared all over her right cheek as she slides down the glass. In the next cut the arresting officers are taking her into custody, and she has a neat yellow blob of icing on the same cheek, and all the smeared red icing is gone.
Continuity mistake: In all the shots of Oddball before, even the computer generated Oddball, her eyes were brown. However, after Cruella gets baked into a cake, when Oddball looks down at her eyes are blue. They switch to a different shot, then come back to her and they're still blue. Later they're brown again.