Continuity mistake: In "The Power of Madonna", as the girls are performing Express Yourself, near the end of the song the coats that Tina, Santana and Brittney have dropped disappear and reappear several times.
Continuity mistake: In "The Power of Madonna", during the Cheerios stilts routine, as the people on stilts lift one leg one after the other, they are in a V shape, and there are both girls and boys on stilts. Yet in the very next shot, as the people on stilts swing the other Cheerios around, there are only 3 Cheerios, all guys, on stilts, and they are in a straight line.
Visible crew/equipment: In "The Power of Madonna", just before Sue drops the Madonna CD onto Figgin's desk, a camera is briefly visible over her right shoulder.
Continuity mistake: During the song express yourself, whilst the girls are dancing on the stage Quinn appears to have a flat stomach but she is supposed to be pregnant at this stage.
Other mistake: In the scene at the lockers with Brittany, Santana mentions having trouble finding a younger man per Sue's orders. However, Santana is a senior in season 3, which would make her a sophomore in season 1. Therefore, she could easily just date a freshman instead of needing Finn.
Answer: According to IMDb.com, Ian Brennan, one of the "Glee" writers and producers, is listed as the uncredited narrator voice.
Michael Albert