When Puck is pushing Artie down the hallway he has ear plugs in his ears, but when he is outside singing with Artie they are gone.
The girls are in a group sewing their costumes for the boys against girls in class competition. Rachel is sewing with a needle in her left hand pinching it between her thumb and index finger when Noah and Artie enter the room. Rachel yells out, "Spies!" pointing her middle finger at the boys. The next cut the needle has vanished and Rachel is now pointing her right hand index finger at the two boys.
During 'Start me up' a camera and cameraman is visible on the left side.