Heather Elizabeth Morris, who plays Brittany, originally came to Glee to teach the cast choreography but was liked by the producers so they wrote a character for her.
The cheerleader outfits (specifically, the skirts) shown in this episode onward are different to the ones shown in the pilot.
Quinn accuses Rachel of eavesdropping and says "Time for some girl talk, Man Hands." The music heard is the credits-roll "theme" song, titled "Time for Some Girl Talk." This is the first time it's heard; it was not used at the end of the pilot.