Continuity mistake: When Lily is making her list she takes the lid off the pen twice. (00:09:00)
Continuity mistake: When Ted and Marshall are watching Sandy Rivers read the paper on TV, the items besides the TV on the TV table switch according to the angle.
Continuity mistake: At the apartment when Marshall gives Lily the red cocktail, the green paper umbrella moves from facing away from Lily to facing towards her between shots.
Nothing Good Happens After 2 A.M. - S1-E18
Continuity mistake: In the first scene the karaoke bar, Barney's drink moves between shots from in his hand at his mouth to set on the table. (00:07:40)
Nothing Good Happens After 2 A.M. - S1-E18
Continuity mistake: In the classroom scene, the girl with the black dress with green sleeves keeps changing position between shots. Her arms are sometimes folded, sometimes flat on the table, and sometimes she is leaning on her elbows. (00:01:40)
Continuity mistake: When Lily and Marshall are discussing which band to book for their wedding, the way Lily's shirt hangs changes frequently between shots. Sometimes the shirt hangs straight, in other shots it is folded back on itself.
Continuity mistake: At dinner, Robin starts eating the ice cream sundae and knocks the cherry off the top. In the next scene, when she passes the sundae to Mike, the cherry is back neatly on top and the sundae looks untouched. (00:12:50 - 00:13:30)
Continuity mistake: The morning after The Wedding, when Lily is talking about throwing the bouquet, the mug in Marshall's hand changes position, vanishes and then reappears instantly between shots. (00:05:20)
Continuity mistake: At the bar, when Robin is telling the gang about Mike, Marshall's beer moves from in his hand to on the table between shots. Also, the amount of beer in the glass changes frequently depending on the camera angle.
Revealing mistake: When Ted is on top of The Lighthouse (with both girls), his and the girl's hair is blowing in the wind, but the trees behind them aren't moving at all.
Continuity mistake: In the scene when Lily yells at Robin, because Lily thinks her wedding is ruined, her hair changes. When Lily screams "Of Course I'm not okay." there's only one stray of hair hanging over her left shoulder, but a few seconds later when she screams "Oh grow up Robin." much more hair is hanging over her shoulder. (00:08:15)
Moving Day - S2-E18
Continuity mistake: In the final scene when Barney is reading his top ten list, the piece of paper moves from his left to right hand and back in an instant between shots,.
Continuity mistake: When Marshall and Lily approach the reception desk at The Wedding chapel, Marshall's cocktail moves from his right to his left hand instantly between shots. (00:07:55)
Nothing Good Happens After 2 A.M. - S1-E18
Continuity mistake: When Ted arrives at Robin's apartment the amount of greenery sticking out from his shopping bag keeps changing between shots. (00:10:00)
Okay Awesome - S1-E5
Continuity mistake: When they first arrive at the club we see Barney, in close up, undo some of his top shirt buttons. A few seconds later, he is seen in the background with his shirt buttoned. (00:05:30)
No Tomorrow - S3-E12
Continuity mistake: Towards the end, when Ted says, "You just yelled at me", look at Marshall. He's about to take a sip of his drink, but when the camera cuts to a different angle, the mug's nowhere near his lips anymore.
No Tomorrow - S3-E12
Continuity mistake: Towards the end, when Marshall's yelling at Ted, Ted says, "You yelled at me". When the camera angle changes, Marshall's hand changes position.
The Chain Of Screaming - S3-E15
Continuity mistake: When they're all sitting in the car listening to Marshall's story, Robin's ice cream changes between shots.
Continuity mistake: When Lily is making the layered salad, in some shots the layers are defined, but in others there is much more mayonnaise running between the layers. (00:07:30)
Chosen answer: In a flash forward scene in Season 8, it shows him with his first born: a daughter.
XIII