American actor Verne Troyer portrayed Griphook, the Gringotts goblin who shows Harry to his bank vault, in ‘Harry Potter at the Sorcerer’s Stone’. Because Troyer was American, however, British actor Warwick Davis dubbed his lines for the film’s final cut (via AugustMan). Davis also portrayed fellow Gringotts goblin in the first film, and he remains a regular in “Harry Potter” as Hogwarts professor Filius Flitwick for the remainder of the series. Davis also reprized the role of Griphook in full for the character’s central role in “Harry Potter and the Deathly Hallows.”
Troyer was one of two American casting exceptions to the series’ strict rule of British actors in the first two films. The other is Eleanor, the daughter of Chris Columbus, who played Susan Bones, a Hufflepuff student in Harry’s year, in “Sorcerer’s Stone” and “Chamber of Secrets.” Columbus has no dialogue in either film, and the character is absent in future films, with Susan Bones’ lines in the book given to other actors.
Besides Verne Troyer’s “Harry Potter” role, the actor is perhaps best known for portraying Mini-Me in the “Austin Powers” spy comedies. Troyer died in 2018 at the age of 49.