How I Met Your Mother

The Fortress - S8-E19

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.

Tanngrisnir

The Naked Truth - S7-E2

Revealing mistake: While showing the clip of Marshall streaking the first time, you can see thumbnails for videos of him streaking in New York. Those videos were created later that day and could not already be posted. One also shows a woman in yellow and appears to be a retake of the scene. (00:06:15)

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Something Blue - S2-E22

Trivia: When Ted and Robin are at the restaurant, they are accidentally sent a champagne glass with an engagement ring in. A man then claims the ring and proposes to his girlfriend. This couple really did get engaged on the show - the guy set up the surprise proposal, as his girlfriend thought they were just there as extras.

pinkwafer

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Chosen answer: In a flash forward scene in Season 8, it shows him with his first born: a daughter.

XIII

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.

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