Old-school comic geeks could tell from Ragnarok's early trailers that the film would draw very heavily from the art style of Jack Kirby, one of Marvel's original architects and the original artist of Thor. A vast majority of the costume designs seen on Sakaar were based on Kirby's drawings of Celestials and other strange alien gods, but one thing was pulled directly from Kirby's comic pages: the enormous drawings on the walls of the Grandmaster's viewing chambers. The guy's got amazing taste.
And of course, nobody missed Thor's original creator, Stan Lee, as Sakaar's shaky-handed barber, right?
And speaking of Marvel's many creators, there's also cousin Carlo. He may be a bit of a throwaway character, and he's most definitely melted all over the Grandmaster's floor, but he was named after artist Carlo Pagulayan, who illustrated part of Marvel's Planet Hulk storyline, which served as the inspiration for much of Ragnarok.