Other mistake: In the final scene, where Ben realises he's inside the mirror world, everything is mirrored. However, the word ECNALUBMA is visible on the ambulance. Since the word ambulance is always written mirrored on ambulances, it should have shown AMBULANCE.
Mirrors (2008)
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Directed by: Alexandre Aja
Starring: Kiefer Sutherland, Amy Smart, Paula Patton, Cameron Boyce
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More mistakes in Mirrors
Ben Carson: You polish them?
Lorenzo Sapelli: I'm sorry?
Ben Carson: The mirrors. They're so clean.
Lorenzo Sapelli: Oh, no, that's Gary. Gary Lewis. The fella who's been working here before you. He was completely obsessed with these damn mirrors. Spent the entire night cleaning them.