I've Got Batman in My Basement - S1-E20
Character mistake: One of the books Sherman is getting his detective stuff from is called "Crime and It's Causes." It must not be a very good book. (00:11:15)
Batman: The Animated Series (1992)
1 character mistake in I've Got Batman in My Basement
Starring: Mark Hamill, Kevin Conroy, Efrem Zimbalist Jr., Loren Lester, Bob Hastings
Genres: Action, Animated, Crime, Drama, Family, Fantasy, Mystery
Factual error: Batman is in Japan and tracks down Kyodai Ken by using Caller ID, which returns a seven-digit "555" number. Telephone numbers in Japan have 8 digits.
More trivia for Batman: The Animated SeriesMore questions & answers from Batman: The Animated Series
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Answer: Because he stole a chemical from his lab.
But Batman knew that with it, Clayface could permanently retain his shape and Clayface desperately wanted to be Matt Hagen again. In a sense, Batman stopped Clayface from becoming human.