Other mistake: When Sharpay is looking for Gabriella in the girls bathroom, she walks past where Gabriella is hiding behind the wall. It is also shown that there is no other room behind that wall. When Sharpay turns around to walk back out, it is impossible that Gabriella couldn't have been seen by Sharpay as she would have been in direct line with her vision. (00:48:45)
Other mistake: During the musical auditions, the pairs audition doesn't start until halfway through the auditions. But the disturbing dancers were a pair audition and Ryan and Sharpay were the only pairs.
Other mistake: On the clock that shows 12:05 (just before the basketball team and the science club start their coup) the second hand isn't moving.
Answer: I'm not positive, but that is what I've always assumed.