* ActorAllusion: Rocky yells "[[Film/{{Braveheart}} FREEDOOOOOOOOM!]]" when he first flies into the farm. Also, one of the chickens says "I'm not even certain he was American.", a reference to the fact that many people, even in the UK, think Mel Gibson is Australian (he was born in the US, but moved to Australia at age 12). Another ''Braveheart'' allusion occurs when asked where he's from:
-->'''Rocky''': Oh, just a little place I call the land of the free and the home of the brave...
-->'''Mac''': Scotland!
-->'''Rocky''': No! America!
** To top it off, there's also a RunningGag with Rocky finding Mac's Scottish accent incomprehensible.
-->'''Rocky''': Was that English?
* DeletedScene: One scene that was cut was how Rocky stole a tricycle from a child. In the theatrical release, this causes some "huh?" as to ''how'' Rocky was riding a tricycle in the ''first'' place.
* DoingItForTheArt
* ExecutiveMeddling: Creator/DreamWorks and composer HansZimmer (who heads the Dreamworks music department) forced director NickPark to drop an already-recorded musical score by WallaceAndGromit composer Julian Nott because Zimmer decided his people should do the score (Zimmer has a history of doing this). This was one of many reasons why Aardman would leave Creator/DreamWorks in 2006 to go to Sony.
* HeyItsThatVoice:
** Ginger is [[Film/PrideAndPrejudice Lydia]]
** TeamDad Fowler is [[Film/PrideAndPrejudice Mr Bennett]]
** Mrs Tweedy also played another [[BlackAdder crazy woman obsessed with beheading]]
** Nick is [[HarryPotter Peter Pettigrew]]
** Bunty is [[HarryPotter Professor Umbridge]], although you'd never recognise her.
* TheMerch: Creator/PlaymatesToys had a ''Chicken Run'' toyline when the movie came out; the Pie Machine was a re-deco of an earlier ''Franchise/TeenageMutantNinjaTurtles'' toy.
* WhatCouldHaveBeen: This film has a lot of them:
** In an early version of the film, Ginger was going to have a little brother named Nobby. He was dropped in an attempt to make the film "less cute."
*** Also, one of the chicken characters was originally a pigeon.
** Fowler was originally a ''drunkard'' who believed himself to be useless until Ginger convinces him otherwise.
** At one point, the movie had a DeusExMachina ending in which the chickens suddenly gained the ability to fly after the crate breaks apart in mid-air. The filmmakers decided it was too far-fetched.
** For a while, the filmmakers considered the idea of having '''Mrs.''' Tweedy be the one attacked and tied up by the chickens in the climax.
** There was animation done of Ginger and Rocky's BigDamnKiss where the beak contact was clearly visible. It looked, as the directors said in the commentary, "like two suction cups stuck together."
** Another idea for the ending involved a SequelHook in which the audience was shown that a second chicken farm is being constructed near the island. It was dropped because Aardman wasn't sure if a sequel would ever be made.
** Originally, instead of the door falling on Mrs. Tweedy on its own, Mr. Tweedy was going to push it. They cut this because it seemed too mean-spirited. Though in the final film you can still see his arm moving back to his side for a second.
** Rocky had a wattle on his neck that was removed during production for whatever reason.
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