
How I Met Your Mother (2005)
1 mistake in The Fortress
Starring: Alyson Hannigan, Cobie Smulders, Jason Segel, Josh Radnor, Neil Patrick Harris
Factual error: The way Barney employs the green screen wouldn't work because a camera is needed to put a picture over the screen. To the naked eye the screen would still be green. The only plausible way to make the illusion work as intended would be a regular white screen and a projector, but this isn't the case here.
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