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Revealing mistake: When the Batcycle slams against the taupe BMW blocking the road, there is no driver inside, to allow for a safe stunt.
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Revealing mistake: During the chase in Gotham, the armoured truck crashes against a jeep. The driver remains stiff as a board, unaffected by the violent impact or any laws of physics, revealing it's a dummy (or a CGI asset).
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Revealing mistake: When the Barrys cross through the glass door, for a couple of shots, Young Barry's face is replaced with a non-realistic CGI face with features that don't match the face contour at all.