Ted says 'bowl' 21 times.
Robin is 29 years old and claims to be 26, while Cobie Smulders was actually 27.
When Ted is teaching Barney, and Barney doesn't pay attention, he mutters "How do I reach this kid?", which is a reference to Stand And Deliver, a movie about a teacher in an inner city class. Later, they reference Dead Poet's Society, another movie centered around a teacher and his students.
Marshall says to Lily and Robin, "Have you two ladies lost weight recently?". It's a reference to their pregnancies in the previous seasons.
Lyndsy Fonseca (Daughter) and Olga Fonda (Candy) have appeared together on the TV show 'Nikita'. They played Alex and Larissa respectively.