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.
How I Met Your Mother (2005)
1 mistake in The Fortress
Starring: Jason Segel, Neil Patrick Harris, Cobie Smulders, Alyson Hannigan, Josh Radnor
More quotes from How I Met Your Mother
More trivia for How I Met Your Mother
Question: Out of Ted's kids in 2030, who is meant to be the older?
Answer: Ted's daughter is older as revealed in a flash forward in 'Trilogy Time', when Ted is with his then-only child: a daughter.
Chosen answer: In a flash forward scene in Season 8, it shows him with his first born: a daughter.
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