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When Troy asks Gabriella to the prom on the school's roof, they waltz to "Can I Have This Dance". Throughout the musical number, the daylight switches back and forth from early morning sun to evening sunset several times, suggesting that the filmmakers spent all day shooting this scene and edited together the best bits, although clearly filmed at different times of day and causing a disjointed feel.

Troy gets green paint on his hands, then climbs over the white fence without getting green paint on it.

When Troy and Chad arrive at the junk yard, Troy gets out of the truck and you can see he has on light blue boxers. When they start singing his boxers change to navy blue or black.

In the basketball game, Troy's hair goes from being very sweaty to almost dry in just a few seconds. It goes back and forth several times.

In the yearbook room, Troy is wearing Converse sneakers. In the next scene, at lunch, he is wearing Vans.

When Troy and Chad break into Jimmie and Donny's lockers and steal their clothes while they were in the showers and run away with their clothes making them chase them around the school. Troy and Chad would've most likely get suspended or expelled for hazing and they would get kicked off the basketball team and they wouldn't graduate.

The drama teacher Ms. Darbus tells Troy to turn out the lights and to lock up. Any teacher would see that the student departed and see that the building was properly locked up. However, Ms. Darbus has great trust in Troy, and also knows his father works at the school. She trusts that Troy would lock up.

During the last song/dance number Sharpay is wearing black high heels covered with rhinestone when she starts to sing. When she starts to dance she is in black socks.

Troy dances through the corridors at night. When he jumps against the wall, you can see many dark footprints, from previous takes.

Kelsi's necklace is backward in one scene, revealing the clear tape used to keep it in place.

In "Right Here, Right Now" you can see the lining of the blue screen which shows the trees and sky on it.

The bag Tiara hands to Sharpay with her coffee inside is clearly empty; when Sharpay takes it she flicks it to look inside and there is obviously nothing inside.

The trees have full summer leaves at the party after the basketball game. The weather would be much colder on a night after a basketball game in Albuquerque, which would have taken place in January or February or March.

When Troy and Gabriella are on the roof Troy says he has never been to a dance before let alone a prom but in High School Musical 2 there is a scene where Troy is in his room talking to his dad and there is a picture on his nightstand of Troy and Gabriella at a school dance.

When Ryan and Kelsi sing the beginning of "Be With You" you can clearly see that they are both singing the lyric "Even if we're miles apart" even though you can only hear Ryan singing until "miles apart."

When the basketball team first get the trophy, the cameraman and some of the crew are reflected in the basketball on the trophy.

When Ryan joins Kelsi in the music room during "Be With You" he looks at a piece of sheet music before sitting down and playing the song on the piano. However, this sheet music shown is only a vocal score and has no piano chords written on it so there is no way Ryan would've known how to play the song.

Tiara Gold enters the same classes as Sharpay despite being in the year below.

While singing at the beginning of the musical, Ryan stops singing in the middle of the word forever.