Continuity mistake: When Will reads the newspaper review of their concert, the date on the newspaper is February 12, 2009. This date is impossible. Most of the Glee kids who graduated in 2012 were sophomores in season 1, and the only way to be in school around the February 2009 date is if the class of 2012 were 9th graders. Only this is not the case. Also, all the football or basketball episodes in season 1 would all be incorrect. The most likely date for Acafellas is September 2009.
Continuity mistake: The DVD Tina brings Mr. Chang. When she leaves she picks it up from the desk, in the last shot it is back on the desk. (00:17:38)
Continuity mistake: Puckerman is on a skateboard and then jumps on to the bench, but the skateboard just disappears.
Answer: According to IMDb.com, Ian Brennan, one of the "Glee" writers and producers, is listed as the uncredited narrator voice.
Michael Albert