Batman: The Animated Series
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Suggested correction: A plot hole is when there is a logical inconsistency that benefits a story despite not making any sense. Something not being explained is not a plot hole. And the reason Batman interrupts the procedure is because Clayface is a criminal who has committed numerous robberies as of late, and Batman is there to apprehend him. As far as Batman is concerned, if Clayface wants to undergo the procedure, then he must do it while in custody.

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Two-Face (2) - S1-E18

Continuity mistake: The broken window pane on the door to the District Attorney's office changes slightly from shot to shot. When first shown, the break in the glass extends all the way up to the letter "L" in the word "law." When the shot changes, the break in the glass is nowhere near the letter "L." Also, the letter "W" in the word "law" is missing entirely, even though the break in the glass suggests a portion of the letter would still be intact if the letters were painted on the glass, as is standard. (00:10:25)

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Two-Face (1) - S1-E17

Trivia: Harvey Dent's demanding of a mirror to see his scarred visage at his doctor's reluctance is very similar to the Joker demanding a mirror from his surgeon in the 1989 "Batman" film. (00:20:30)

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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.

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