In Robin's room (at Marshall and Lily's place) many of the board games by "Aldrin games" (created by Lily's father) can be seen, like "Slap Bet" or "Dog Fight Promoter".
At the 2:20 point, when Lily hugs Robin, someone farts
Arielle Reitsma who plays Kismet, started her career as an extra in films such as Bride Wars (2009), and Surrogates (2009).