How I Met Your Mother
All season 3 mistakesMistakes
1Wait For It...3
2We're Not From Here2
3Third Wheel0
4Little Boys0
5How I Met Everyone Else3
6I'm Not That Guy0
7Dowisetrepla1
8Spoiler Alert2
9Slapsgiving2
10The Yips1
11The Platinum Rule1
12No Tomorrow3
13Ten Sessions0
14The Bracket0
15The Chain Of Screaming4
16Sandcastles in the Sand1
17The Goat0
18Rebound Bro0
19Everything Must Go4
20Miracles2

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)

More mistakes in How I Met Your Mother

Marshall: You should definitely go. Look, it's a chance to show her you are still friends and that you support her.
Barney: Or it's a chance to mess with her head by showing up with someone hotter, or even better, triple threat, hotter and bigger boobs!
Ted: That's only two.
Barney: Count again.

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Bad News - S6-E13

Trivia: Throughout the entire episode Bad News (Season 6, Episode 13), there's a number in every scene. These numbers are a countdown for the news that Marshall will get at the very end of the episode.

Douglasac

More trivia for How I Met Your Mother

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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