Best sci-fi movie mistakes of 1970

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Beneath the Planet of the Apes picture

Deliberate mistake: There are absolutely no lights ever to be found in the underground world and the ceiling is literally the surface's ground, but there is still a perfect level of lighting in the underground world regardless.

Casual Person
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Trog picture

Continuity mistake: When Dr. Brockton is descending into the cave her hair changes from one style to another.

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