All There in the Manual: The original short story of "The Crate" points out that "Fluffy" wasn't found in the north arctic, but rather what would come to be known as the Antarctic region (as the term "Antarctica" didn't exist in 1834, when the crate was shipped to Horlicks). So the monster in the crate was somehow captured almost 100 years before the 1930 Miskatonic University Expedition, one presumes.
Dawson Casting: Robert Harper plays teenage college student Charlie Gereson, even though he looks like he's in his mid-40s.
Defictionalization: An actual Creepshow comic was made adapting the movie's stories, although they were presented in a different order than they were in the film (and included scenes that didn't make the final cut of the movie).
Recurring Element: The marble ashtray prominently used to kill Nathan Grantham in the first segment shows up somewhere in the other segments as well. In The Lonesome Death of Jordy Verrill it's next to the cash box at the Department of Meteors. Something to Tide You Over has it on the nightstand next to Richard's bed. It's on the writing desk where Henry writes the letter to Wilma in The Crate. Upson Pratt uses it as a soap dish in They're Creeping Up On You. It also appears in the end portion of the framing story on Billy's desk when he first starts stabbing the voodoo doll.