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Deliberate mistake: Enter The Cheatrix: Any time in this level that shows one player jump into a pipe, the next scene shows two players exiting the pipe at the same time.
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Continuity mistake: Enter The Cheatrix: After Bart and Lisa break into Frink's basement, they discover a Rift Portal. The first shot shows the "DO NOT USE" sign a foot above Bart and Lisa's height. But as Bart walks into the portal, the sign is suddenly located at the same height as Bart.