No Tomorrow - S3-E12
Continuity mistake: At the Saint Patrick's Day party when Barney says, "it's not cheating if her name has two adjacent vowels" his right hand is up near his left hand, pointing to his fingers. When the camera angle changes his hand is back at his stomach.
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.
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