Other mistake: When Ralph Macchio mocks Barney for not gambling in AC, Barney makes a U-turn to head back, but turns the wheel to the right instead of the left. (00:12:00)
How I Met Your Mother (2005)
1 mistake in The Bro Mitzvah
Starring: Jason Segel, Neil Patrick Harris, Cobie Smulders, Alyson Hannigan, Josh Radnor
Barney: It's gonna be legen...wait for it...dary!
More trivia for How I Met Your Mother
Lucky Penny - S2-E15
Question: I'm confused, what exactly was wrong with Barney's legs in this episode? Why couldn't he move them?
Answer: After running the marathon for Marshall with no training, he's allowed to ride the subway for free. While sat on the train, the muscles in his legs start to seize up after the marathon to the point it is painful to move his legs. This is why he can't move them. It's the same reason your body aches after a good session at the gym the day before.
Answer: Barney ran a marathon without any training and over exerted his muscles. While he was able to walk after, later his leg muscles gave out and he couldn't move (or more likely stand). It is not uncommon when one works out too much to be sore the next day, even if they feel okay afterwards. Thus the saying "I'll feel that in the morning."
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