Continuity mistake: Robin says in this episode that she never played team sports and was always a loner. However in a later episode, (The Prom episode) she mentions she missed her prom due to field hockey nationals.
Matchmaker - S1-E7
Continuity mistake: When Marshall comes out of his room with the book about the Roswell Incident, he's holding the cover and first pages bent under the book, next shot he's just holding them normally, then they're bent again. (00:14:30)
Visible crew/equipment: When Marshall runs through the smoke towards The Limo, you can see the fog machine in front of Barney's head used to create the "smoke" effect. (00:17:40)
Life Among the Gorillas - S1-E17
Continuity mistake: At the karaoke bar, just before Lily storms off, the song book changes position on the table between shots.
Continuity mistake: In the opening scene at the bar, the level of beer in Ted's glass goes up and down between shots. (00:02:30)
Continuity mistake: When Marshall runs after Ted to tell him to get French Onion Dip, his robe keeps changing from crossed over his chest to straight down. (00:10:10)
Continuity mistake: When the Hula girl realises the penguin is Barney she holds her hands out and walks off. Camera cuts and her hands are on her hips. (00:17:30)
Continuity mistake: In the closing scene at the bar, the level of beer in Marshall's glass goes up and down without him drinking any. Also, the glass goes from in his hand to on the table in an instant between shots. (00:19:25)
Continuity mistake: When Robin leaves to get Battleship, Barney thinks they're going to have sex, whips his belt off, and throws it on the floor. When Robin returns, he's neatly folding his pants and draping them over a chair, and his belt is still threaded through the loops. (00:16:20)
Suggested correction: He could have easily done that himself so it was easier to put back on afterwards.
This correction is too much of a stretch. It would make no sense for him to take off the belt and throw it to the ground in the first place. He was alone at that point, so he wasn't doing it to impress anyone and he's been in this position before.
Continuity mistake: When Lily and Marshall are talking in the kitchen, we see Lily put down the recipe card to the left of the jar of mayonnaise. The shot changes and the card is now to the right of the jar. (00:06:25)
The Pineapple Incident - S1-E10
Continuity mistake: When Marshall gives Ted the phone to find out who's number is on his arm, he presses 2 buttons then gets through. No time to dial the number. (00:12:00)
Matchmaker - S1-E7
Continuity mistake: At the Matchmaker's office, when Barney is saying he just wants someone to hold, Ellen is seen putting her pencil down on the desk but in the next shot it is in her hand again. (00:03:50)
Continuity mistake: The morning after the second party, the items on the coffee table change instantly between shots. Several beer bottles and blue cups vanish, whilst a red cup and red bowl appear. (00:11:00)
The Wedding - S1-E12
Continuity mistake: In this episode, Lily is in Robin's house with her dogs. In the episode "World's Greatest Couple", Robin reveals that Lily can not stay at her apartment because Lily is allergic to dogs.
Suggested correction: Doesn't mean Lily can't go over and visit for a while. My mother is allergic to cats. She can visit her cat-owning friends for a while, though she would never stay overnight. Pet allergies can be pretty controllable, as long as you're not constantly in contact with the animal.
Continuity mistake: When Steph is telling Ted that she used to star in adult films, we see her pick up the mini corn with her chopsticks from one angle, then the shot changes and she picks it up again. (00:02:30)
Continuity mistake: In the final scene at the bar, Barney is seen eating the olive from his drink and discarding the stick. A second later, when the shot changes, the olive and stick are back in his glass.
