#source: imbd

Helena Bonham Carter’s grandmother, Violet Bonham Carter, was friends with Prime Minister Winston Churchill. In The King's Speech (2010), Helena acts opposite Churchill, as played by Timothy Spall.

In May 2006, Helena Bonham Carter launched her own fashion line, "The Pantaloonies," with swimwear designer Samantha Sage. Their first collection, called Bloomin' Bloomers, is a Victoriana style selection of camisoles, mop caps and bloomers. The duo are now working on Pantaloonies customized jeans which Helena describes as "a kind of scrapbook on the bum.". 

Corbin Bleu came up with the slogans that appear on the shirts that he wears in the movie.

Zac Efron's singing voice was that of Drew Seeley, who tested for the role of Troy. Seeley sang the entirety of "Get'cha Head in the Game" and the reprise of "What I've Been Looking For." Efron only sings the first four lines of "Start of Something New," the first sentence of "Breaking Free," and during the scene on the balcony. The reason for this is because Efron's natural voice was too low for that of a tenor and the producers wanted a tenor to match the role.

The cell phone ring that gives the class detention has the tune of the song "Start of Something New."

It took 24 days to film this movie.

The falling snow in the New Year’s scenes were potato flakes.

Matthew Underwood from Zoey 101 (2005) was offered the role of Troy Bolton, but because of his contract with Nickelodeon, he was forced to decline the role.