Both Lyndsy Fonseca (Alex) and Todd Grinnell (Dale Gordon) have appeared in the TV show 'How I Met Your Mother', though they never worked together. They played Daughter and Insane Duane respectively.
When Seymour Birkhoff calls Nikita (at 21:02) the ENN employee's cellphone ringtone is the same sound used for the Sesfonstein Productions tag heard after each episode's credits.