The show is based on creator Ian Brennan's experience in show choir at Prospect High School in Illinois. See more...
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Deliberate "mistake": When the kids are opening their lockers, they enter the code, then pull on the lock to open the locker. The closed lock is still attached to the front of the locker. When they close it, it's magically locked again without them ever opening or closing the lock. In reality, these locks would be useless, or the locker doors wouldn't open.
Continuity: Throughout the show, the character's lockers continually change position. For example, Rachel's locker is at first near the end of a row, a few down from Quinn's, yet later it's in the middle of the row, nowhere near any of the other Glee kid's lockers, and even later it's the second one down in a completely different row.