'Elf' Turns 20! Will Ferrell Explains How He Transformed Into a Giant (Flashback)

Will Ferrell and director Jon Favreau chatted with ET about making 'Elf.' In these 2003 interviews, they opened up about finding inspiration in the stop-motion holiday classic, 'Rudolph the Red-Nosed Reindeer.' Favreau and Papa Elf himself, Bob Newhart, explained how forced perspective camera tricks made the 'Saturday Night Live' alum look giant-sized on the North Pole set.