Two Interesting Things About this Special People May Not Know

Believe it or not, Elmo Shropshire, who sang the original song (great song, BTW) voiced Grandpa in this special!

Also, the songs "Grandma's Killer Fruitcake" "Grandpa's Gonna Sue the Pants Off'a Santa" are actual songs that he also sang, the latter which in a way is a sequel to the original song. Both sound way better than the film's versions though.