Corrected entry: Robin walks into the apartment and sees a goat turd, which can only be there if the goat was in the apartment. She goes on to talk to Marshall about keeping quiet about the fact that she slept with Barney, so we know that this happened when Ted was turning 30. But later in the end, Ted says that the goat was actually there on his 31st birthday. So the goat turd could not have been there at the time.
Corrected entry: When forced to explain himself to Quinn in 1 minute after finding out Barney and Robin used to date, Barney incorrectly states that Robin moved to Brazil and came back with "a Latin stud" after Ted and Robin broke up. Robin actually vacationed in Argentina. (00:11:35 - 00:12:40)
Corrected entry: This episode takes place during the holidays and Robin is missing her family. At the very end of the episode Robin and Marshall are sitting outside - Robin is eating an ice cream cone and Marshall is drinking an icee, and they are both wearing T-shirts. Behind them are poinsettia plants and they mention Christmas in the episode. They live in New York. It snows in New York during the holidays or is at least cold. They would not be wearing T-shirts sitting outside on the stoop eating ice cream.
Corrected entry: When the gang is thinking about baby names, Esther is brought up. We then see Marshall and Barney at the strip club where Esther shoots out a bunch of playing cards and one sticks to Barney's forehead. He peels it off and says "That WAS my card!" But he never looked at the face of the card, so he couldn't possibly have known which card it was.Knever
Corrected entry: Cindy's claim that there is a policy against faculty and students dating is right, but according to the website of Columbia university it doesn't apply to a relationship between Ted and her. Excerpt from the policy on consensual romantic and sexual relationships between Faculty and Students of Columbia University: "It is the policy of the University that no faculty member shall have a consensual romantic or sexual relationship with a student over whom he or she exercises academic or professional authority."Tanngrisnir
Corrected entry: In S3E15 "The Chain of Screaming" Barney is talking about Gary Blauman confronting his boss, and when Marshall asks, "Is that the end of the story?" Barney replies, "No, no of course not. He died." But in s9e21 the entire episode is about Gary Blauman.Nathan Ehrnsberger
Corrected entry: In this episode we get to see when Ted met Marshall. But in Season 2, episode 1 Ted says to Marshall, "And there was my roommate, lying on the bed with his feet up on the wall. He had headphones on, big smile on his face. That guy was you." In this episode we get to see it was different. (00:04:40)IDFS33140
Corrected entry: In this episode Marshall and Lily buy an apartment that turns out to be crooked. When Marshall is hanging the picture it slants to the left of the camera each time he tries to straighten it, however the apartment is slanted to the right, on camera, and also demonstrated by Robin when she rolls the champagne bottle.