The person who played the role of Grampu was Tyler Bunch. Bunch is a puppeteer (an actor who works with puppets) known from the show "Sesame Street". While he was playing the part of Grampu, Bunch had to never shave his arm, so that Grampu would look like an old, hairy man. This was different from the other actors, who all had to shave their arms because they played kid characters. Bunch had a manicurist who filed his nails every week during filming.