I'm skipping Buffyverse for a moment, because apparently there's more:
Lyndsy Fonseca (Ted's daughter) was in
I Do, They Don't with Wayne Brady (Barney's brother).
Joe Nieves (Carl) just finished a movie called
Float with Cristine Rose (Ted's mother).
April Bowlby (Meg - one of Barney's top 5 from The Bracket) is currently filming
The Slammin' Salmon with Cobie.
To be honest I didn't think there'd be that many connections
