Other mistake: Right before 'La Vie Boheme' in the Life Cafe, just after the host requests that the tables not be moved, Angel says 'Hey ROSIE, let's push these tables together.' Rosie is the name of the actress (Rosario Dawson,) the character's name is Mimi.
Other mistake: At the very beginning, when the lights rise above the cast you can see they're all equally spaced out and the light has the same brightness for each character. At the end of the song, the camera shoots to the back filming everyone from behind, note Mark, he's crammed in the corner next to Angel with out the same amount of space originally he started with and his light is very dim compared to the seven others. (00:02:45)
Answer: Angel says "I can feel his balls".