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)
The Pineapple Incident - S1-E10
Continuity mistake: When Lily says "No dibs" and touches her nose, she does it with her right arm/hand, but in the next shot, her left arm/hand is on it. (00:05:55)
The Pineapple Incident - S1-E10
Continuity mistake: When Ted is explaining to Robyn about Trudy he points at the door. Camera cuts and his arm has been lowered. (00:20:20)
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)
Chosen answer: She was finally shown at the very end of the last episode of season 8, continuing into season 9. The actor's name is Cristin Milioti: http://www.imdb.com/name/nm2129662/.
Knever