Superman II (1980)

Plot hole: Lois and a friend of hers are watching Non and Superman fight. But this is totally senseless, because Superman had been flying around Metropolis and chances are slim that he appears in the very same spot to let Lois watch him. And, second and most important, should any doubts arise, the panning angles of the camera never show Lois's building, with the big broken window and the flag poles.

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Plot hole: When the villains rampage Perry's office and later fly through the windows, no one ever comes close to the pillar between the windows, nor any violence is done around it. However, after the fly away the pillar falls down on the street.

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