The most obvious example is 60s and 70s car chase footage, a la Starsky and Hutch, but it is also common in kung fu movies of the same era. How can we “just tell” that the footage is sped up?
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Altered gravity is the easiest tell, everybody subconsciously knows how fast things would fall normally because we’ve seen many thousands of things fall or thrown since childhood. So if a footage has altered speed it will make things drop faster or slower than normal you expect.
There is a trick in special effects using that perception where they explode a miniature model filmed on high speed camera, so when it’s played normally it looks like a realistic much bigger explosion, because we trick ourselves by extrapolating size from the falling debris speed expecting it to be constant.
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