First time there is an opening scene before the credits.
Robin calls Ted "Teddy Bear" in this episode at the bar, but in later episodes it is established that she hates nicknames, along with all "couple-y stuff".
When Lily (in Marshall's imagination) is talking about dancing on stage with George Clinton "Courteney Cox style", is a reference to Bruce Springsteen's video "Dancing In The Dark", where Bruce Springsteen chooses Courteney Cox from the crowd to dance with him on stage.
First time Barney says something and then says "true story"
Comedian Joey Diaz can be seen in the background behind Marshall and Ted at the baseball game.