Life Among the Gorillas - S1-E17
Continuity mistake: At the karaoke bar, when Marshall is deciding which song to sing, his beer bottle keeps switching hands between shots.
Continuity mistake: When Robin and Barney meet up for drinks, the amount of ash on the end of Barney's cigar goes up and down frequently between shots. (00:06:10)
Continuity mistake: When Lily drops the potato chips on top of the 'salad', we can see a few chips sticking up beyond the top of the bowl. The shot changes and now the chips are laid flat, with none sticking up over the top. (00:07:40)
Continuity mistake: When Robin is talking to her boss about his dog, the pens and pencils in the holder on his desk change depending on the camera angle.
Continuity mistake: When Barney is crouched down, leaning against Robin's chair, the money in his right hand vanishes between shots.
Continuity mistake: In the opening scene at the bar, when Ted is debating whether or not to ask out Robin, Marshall's beer is in his hand when the camera is on him, but on the table when the shot is from behind him. (00:03:00)
Continuity mistake: After Natalie throws spaghetti at Ted, the amount and position of the spaghetti pieces changes instantly between shots.
Continuity mistake: When the gang are discussing what Ted should say to break up with Natalie, the amount of beer in Marshall's glass goes up and down between shots.
Nothing Good Happens After 2 A.M. - S1-E18
Continuity mistake: When Ted arrives at Robin's apartment, he gets out of the taxi. Camera cuts to outside, and he opens the door and gets out again. (00:09:50)
Continuity mistake: When Ted is talking about getting a blessing from a pimp, Barney's drink just disappears from the table. (00:03:35)
Nothing Good Happens After 2 A.M. - S1-E18
Continuity mistake: When Robyn is leaving at the start, the dogs change place instantly. Note the Dalmatian. (00:01:30)
The Pineapple Incident - S1-E10
Continuity mistake: When Trudy takes Ted's phone she grabs it with 2 hands. Camera cuts and now she has one hand on her face. (00:17:35)
Matchmaker - S1-E7
Continuity mistake: In the opening scene at the bar, when Ted and Barney are discussing the idea of going to visit a Matchmaker, Ted's beer glass suddenly goes from being about a quarter full, to being nearly three-quarters full. (00:02:20)
Continuity mistake: When breaking up with Natalie, her hands are constantly changing position between instant cuts. (00:18:30)
Continuity mistake: When Ted mentions having a party, Marshall's hand goes from on his beer to on his chin instantly. (00:03:10)
Continuity mistake: In the pilot episode we see the Son and Daughter listening to the start of the story on how Ted met their mother. In the final episode of the show it's revealed that the whole story has taken place in one sitting. However, the clothes the kids are wearing and the items around them are different in the pilot episode to every other episode. The sofa is a different design, the cushions appear etc. (00:00:45)
Okay Awesome - S1-E5
Continuity mistake: Ted asks if he had a stroke at the start of the episode and puts his hand to his chest. Camera cuts and his hand has swapped from his right to his left on his chest. (00:00:35)
Continuity mistake: Barney tells Lily that she's rubbing his leg. When he does, a wine glass suddenly appears in Lily's hand. (00:03:20)
Chosen answer: In a flash forward scene in Season 8, it shows him with his first born: a daughter.
XIII