I loved this skit! Also, it's clear Heidi Gardner must have not seen them in costume until the live performance. She lost it and that would have happened to me too if I was in her shoes!
I think it was an interview with Seth Meyers, but somewhere Heidi said she had seen them in costume, but Mikey's lip prosthetic/makeup was much more extreme in the live performance than in rehearsal, and that was what caught her off guard and made her break.
