Other mistake: When Ralphie and Flick are walking to school for the first time, they meet up with Schwartz, coming down the steps of his house which appears to be two houses down from Ralphie's. Later, when Ralphie is lying in bed after the soap in the mouth scene, the narrator (older Ralphie), states how "Three blocks away, Schwartz was getting his."
Other mistake: Scrooge drops several gold coins into Mole's hat and places the hat on Mole's head. When Mole removes the hat, there are at least 40 coins but Rat exclaims, "Twenty gold sovereigns!" (00:00:22)