(Talking about the woman they think Barney is dating)
Ted: Where does this woman live?
Robin: We're talking about a woman who has actually gotten Barney Stinson to commit. I'm guessing Narnia.

Stage Mom: You said that if I slept with you, my son would get the part.
Barney: Well, apparently I'm a better actor than your kid.

Barney Stinson: Call me crazy, but child actors were way better in the 80s.

This is a reference to Doogie Howser, M.D, a 1980s television show starring then-child actor Neil Patrick Harris (now playing Barney Stinson) as Doogie Howser.