Phil's Sexy, Sexy House - S7-E7
Continuity mistake: Phil is holding a plate with a red napkin on it while he speaks with Cam and Mitch, then after a camera change, the napkin is hanging on his left hand beneath the plate. After another camera change the napkin appears over his plate again. (00:00:50)
Answer: He has seen himself dancing, and is mortified at how bad he looks.