Bill Erwin was the 1st and original voice portrayer for Grandpa Longneck in The Land Before Time. He had passed away from natural causes at age 96 in December 29, 2010.
- Despite being credited, Erwin's only "line" as Grandpa Longneck in the original movie was some laughter that he and Grandma Longneck gave after Littlefoot got his first Treestar. Despite also being heard, Grandma's original actress was never credited. This, and the fact that many scenes from the film ended up on the cutting room floor, has lead to speculation that Irwin originally had a larger speaking part in the film.