Andy Richter is revealing a not-so-well-known fact about the cheery holiday movie Elf. “There was this old mental hospital that had a couple empty wings, and that’s where the offices are, the Hobbs’ home, the mailroom; almost all the interiors of the movie are in a mental hospital that was still functioning a little bit. There was still a wing of the hospital that had patients in it,” the comedian, 60, exclusively told Us while promoting his new book, Elf Unwrapped: Behind the Scenes of a Modern Christmas Classic. Richter notably played the character Morris in the film, and...