One of the major selling points in the Mexican dub was the voice of famous comedian Eugenio Derbez as Donkey. While Humberto Velez was Farquadd.
In the Spanish dub, Shrek and Donkey were voiced by Juan Antonio Muñoz and José Mota, the members of the (now separated) popular Spanish comedy duo Cruz y Raya, which counts as this, Celebrity Voice Actor and Relationship Voice Actor at the same time.
Prince Charming as the fox in the first Narnia film.
Mike Myers' voice for Shrek greatly resembles the voice he used for another Scottish character he played: Fat Bastard from the Austin Powers movies (or Andy Grey from the short-lived Saturday Night Live sketch, "Scottish Soccer Hooligan Weekly")
In addition to voicing Shrek, Mike Myers also voices one of the Three Blind Mice in the first movie.
Captain Hook sings songs by Tom Waits and Nick Cave. It's pretty noticeable since both artists have very different voices.
The original script had Princess Fiona born an ogre to the late King and Queen of Duloc. They had her locked in the tower under the lie that she was "of such rare beauty" she was kidnapped. They died, and the kingdom was left under the rule of an ambitious regent (implied to be Farquaad). When she 'became of age' to ascend the throne she escaped the tower and encounters a witch named Bib Fortuna (a reference to the Star Wars character of the same name) - who has narrated the entire sequence through her tarot cards. She gave Fiona a potion which would make her beautiful; but Fortuna warns her the potion has a side effect - she will change between her human and ogress form until she finds her true love. Later she was whisked away by her dragon guardian and returned to the tower. This storyline was not adapted to keep the story simple, but is mentioned through the "witch" Fiona tells Donkey about.
Chris Farley was originally cast as Shrek and even recorded part of the dialogue. When Farley died, another SNL cast member got his part (Mike Myers).
Paul McCartney originally was in talks to voice Rumplestiltskin, even going as far as having a musical number for him planned with a song written by McCartney himself.