Beware the Batman (2013)
0 character mistakes in show generally - chronological order
Starring: Anthony Ruivivar, JB Blanc, Sumalee Montano
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Character mistake: Bruce and Alfred play a short game of chess, after which Alfred remarks, "I don't know why we bother playing this game - you never lose." The problem is, Alfred moved into a position wherein Bruce could take his king; this is called "moving into check" and is not allowed in chess.