Between takes, Cory Monteith (Finn), Mark Salling (Puck) and Dianna Agron (Quinn) go hi-tech. Says co-creator Brad Falchuk: "They're always trading iPhone apps and taking really goofy pictures of each other."
Lea Michele (Rachel) dances on-camera with Harry Shum Jr. (Mike). Who's the slowest at learning choreography? Salling jokes, "Take the first two syllables of that word and figure it out!" (Sorry, Cory.)
Jane Lynch's cheerleading coach Sue Sylvester is Glee's queen of mean, but on-set only one thing riles her up: "We had this wonderful thing for a while called Fit Food. It was all organic and tasty. But it cost too much, so they took it away!"
Salling (kissing up to Kevin McHale, who plays Artie) is all swagger as Puck, but really "he's a pussycat," says Falchuk. "He's always sweet and humble."
Matthew Morrison (Will) talks with cinematographer Chris Baffa (left). Says Falchuk: "They're getting savvy with 'Where's the light? Where should I be standing?'"
Heather Morris (left, Brittany) and Naya Rivera (Santana) "are always in a two-shot," says Falchuk. "They are just funnier together."
Amber Riley (Mercedes) and Chris Colfer (Kurt) love playing the party game Mafia on-set. "Amber is good at it," Colfer says. "She will fight you! I just laugh uncontrollably."