Zac Efron commuted from Toronto where he was filming Hairspray to record the soundtrack. That is why his hair seems darker than normal in the promo commercials.
More from High School Musical 2
Trivia In one scene when Gabriella waves at Troy from the pool, Troy responds with a modified "wink-and-click" gesture. It was his trademark as Link Larkin from Hairspray.
Trivia Zac appears more muscular in HSM2 while he was thinner in HSM1. That was because he gained 15 pounds of muscles in a workout regimen for Hairspray.
Trivia Ryan wore nine different hats in the movie.
High School Musical 2
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