The sprites of Geno's star form when possessing the Geno doll and those seen at the end of the game are vastly different, the former being a small, white, almost realistic star while the latter was a yellow, more traditional Mario star surrounded by yellow dots. Similarly, the sprites of the Geno doll when playing with Gaz and the one sitting pose of it seen at the end of the game are proportionally inaccurate to each other.
Contributed by game4brains