There were 70 songs used in the first 13 episodes alone
Singing is done by the cast members in a studio, and is added to the episode in post.
Sue has only called Emma by her proper name in one episode; the pilot. In all other episodes she has "mistakenly" called her names like Alma, Irma, Arlene, Ellen, You, or the Redhead.
Lea Michele is 8 years old than the character she plays
They have had to stop filming several times because Kevin has been tapping his feet to the music; he plays a character that is paralysed from the waist down.
On the day of her audition Lea Michele was in a car accident, she was still picking pieces of glass out of her hair when she arrived.
They did not cast the role of Quinn until the night before filming started
The only episode where Sue actually calls Emma by her proper name is the pilot, for the rest of the time she "mistakeingly" makes up names such as Alma, Irma etc.
The role of Kurt Hummel was written after Chris Colfer's audition because it was never part of the original script.
Cory Monteith's audition tape was him drumming on Tupperware containers and glasses with no actual singing.
The role of Rachel Berry was already written with Lea Michele in mind.
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