According to Netflix data, this is the most watched episode of the series.
The first time that Ted's room is shown.
Danica McKellar also starred in The Wonder Years (1988) which was also told in retrospective with narration.
At the beginning of the episode, Marshall discusses with the group on how he believes Bartender Carl is a vampire. Alyson Hannigan starred on the tv show Buffy The Vampire Slayer, in which vampires are a main issue on the show.
Robin has the same phone as Gabriella in the Disney Channel movie High School Musical