Even after a remark about "We'll have to do something about Puckerman's hair" and Puck actually showing up in the choir room with a wig, he is not wearing the wig during the number in the auditorium. However, after the performance of the song, he is wearing it when talking to Lauren--in the auditorium.
When lamenting the lack of attention their girlfriends pay them post Valentines Day, Artie complains "...they come down from their See's candy high...". See's Candy is a 90+ year old and iconic chocolatier based on the West Coast but nearly unknown on the East Coast and the sole store in the state of Ohio (where the story takes place) opened after this scene was shot.