Visible crew/equipment: When Haley walks into the kitchen she tells Dylan they're over and hangs up on him. Then when Haley's cell rings, as the camera quickly pans around, the pink T-mark becomes visible on the floor behind Haley. (00:04:35)
Continuity mistake: When Claire comes in the kitchen a wine bottle with a blue/white label is standing up on the table. When Luke explains the effects of Jägermeister the same bottle is lying down on the table. In the next scene the bottle is standing upright again. (00:16:10)
Answer: He has seen himself dancing, and is mortified at how bad he looks.