Shrek

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• The song "All Star" by Smash Mouth, heard in the opening credits, was only placed in the film for test audiences until a new song could be found. But But test audiences loved it, and the producers kept it in. When the producers decided to keep "All Star" they decided to let the band sing the last song in the movie, "I'm a Believer."
• Movie Goof (incorrectly regarded as a mistake): Near the end of the movie, when Shrek and Donkey are rushing to make the wedding, Shrek climbs up the chain to get on the dragon. Previously, it has been assumed that the dragon then flies off, but if you look closely, the dragon lifts Donkey onto her back with her paw, and Donkey is present at all times.
• When Donkey and Shrek are looking up at the stars, Shrek points out the constellation "Bloodnok the Flatulent", a reference to the character Major Bloodnok, created by Spike Milligan and voiced by Peter Sellers in the 1950s BBC Radio program "The Goon Show".
• Chris Farley was originally cast as Shrek and even recorded part of the dialogue. However, after his death, the role was given to fellow Saturday Night Live performer, Mike Myers. Shrek's "air quotes" in the film is an homage to Farley, whose character Bennett Brauer also used air quotes.