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In one scene, Troy Bolton's underwear seems to magically change color.
The college that Troy is being scouted by actually closed in 1986.
Sharpay Evans is left-handed, and some of her outfits are coordinated to match her dog's.
"High School Musical 2" made its debut 13 years ago, and it's since become a classic summer film.
The second installment in Disney Channel's "High School Musical" trilogy, "HSM 2" is known for its catchy songs and for helping to launch the careers of several of its main actors.
But even superfans may have missed a few Easter eggs, sneaky details, and goofs from the film.
Keep reading to see some interesting details and slight mishaps in "High School Musical 2."
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Jason is awake during part of the homeroom scene, but is somehow asleep a minute later.
Jason wakes up and falls asleep really quickly, apparently.
Disney Channel
Chad wears several T-shirts with quirky phrases that were crafted by the actor who played him.
Corbin Bleu said he came up with the slogans for Chad's T-shirts.
Disney Channel
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Troy's underwear seemingly change color during the opening song.
Troy Bolton's underwear appear to go from white to dark blue.
Disney Channel
There's a "Twinkle Town" poster in the classroom.
The "Twinkle Town" poster is an Easter egg from season one.
Disney Channel
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In the same display, there are photos of Sharpay in a crown and a scene from the first movie.
You can see Sharpay in a crown and a scene from "Bop to the Top" from the first movie.
Disney Channel
Sharpay Evans is left-handed.
Ashley Tisdale, who played Sharpay Evans, is left-handed, too.
Disney Channel
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Sharpay's dog carrier has her initials on it. Her dog also belongs to the movie's director.
Sharpay's dog was played by Kenny Ortega's real-life dog.
Disney Channel
Troy's name tag disappears during part of "Work This Out."
During "Work This Out," Troy's name tag briefly vanishes.
Disney Channel.
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Troy's red and white shirt appears in all three "High School Musical" movies.
Zac Efron as Troy Bolton in all three "High School Musical" movies.
Disney Channel
There's a basketball propping up the car Troy and his dad are working on.
Many seasons with Coach Bolton include a basketball somewhere.
Disney Channel
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Taylor and Gabriella drive a golf cart onto the Lava Springs baseball field, even though Gabriella's close to getting fired.
Gabriella has two strikes from the Lava Springs manager.
Disney Channel
Some of the Wildcats appear to have their own, customized baseball uniforms.
Chad's baseball uniform has the same number as his Wildcats basketball one.
Disney Channel
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Chad claims he doesn't dance, but we've already seen him dance multiple times.
Chad, played by Corbin Bleu, has danced many times before this song.
Disney Channel
Ryan and Chad switch clothes after the baseball game.
Corbin Bleu and Lucas Grabeel in "High School Musical 2."
Disney Channel
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The college that Troy's being scouted by actually closed in 1986.
In real life, the University of Albuquerque closed decades ago.
Disney Channel
Sharpay coordinates outfits with her dog throughout the film.
Boi Evans has a tiara and so does Sharpay Evans.
Disney Channel
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Viewers don't actually see Gabriella remove her "T" necklace.
This is important to remember for a later scene in the film.
Disney Channel
Troy has his basketball jersey framed in his bedroom, but it's gone by the third film.
Troy Bolton's number-14 jersey.
Disney Channel
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Chad wears the same necklace throughout the movie — and he wears a similar one in the first and second films, too.
Corbin Bleu in "High School Musical" 2.
Disney Channel
While singing "Everyday," the volume of Troy's voice stays the same even though he doesn't sing most of the song into the microphone.
The volume of Troy's voice doesn't change after he gets a microphone.
Disney Channel
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Gabriella is somehow wearing her "T" necklace again during "Everyday."
Vanessa Hudgens in "High School Musical 2."
Disney Channel
Troy and Gabriella don't actually have their first kiss until the end of this movie.
Zac Efron and Vanessa Hudgens in "High School Musical 2."
Disney Channel
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Miley Cyrus has a brief cameo during the last song.
Miley Cyrus in "High School Musical 2."
Disney Channel