Shirley Henderson, the girl who played Moaning Myrtle (the ghost in the bathroom) was actually 37 years old when she played the character in the Harry Potter series.
8
Ian McKellen and Patrick Stewart had no idea how to play chess when they appeared in X-Men 2.
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Hugh Jackman walked around Comic Con wearing his full Wolverine costume and nobody noticed.
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In Jurassic Park, the T-Rex wasn't supposed to come through and break the glass roof of the explorer during the attack scene, subsequently producing the noticeably genuine screams from the children.
9
John Hughes shot The Breakfast Club and Ferris Bueller’s Day Off back to back to save money. He also used the same crew and sets, including the high school with the same posters on the walls.
4
Sean Connery turned down the role of Gandalf in Lord of the Rings because he didn't understand the script.
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