Kris claims that John Quincy Adams' Vice President was Daniel D. Tompkins. In fact, it was John C. Calhoun, while Daniel D. Tompkins had been Vice President under Adams' predecessor, James Monroe. The confusion arose because Adams was the 6th President whereas Tompkins was the 6th Vice President, some Presidents having had a different Vice President in each term, and one of the latter having served under 2 of the former.
Kris' license lists one of his reindeer as Donder (Dutch for thunder), yet whenever this name is spoken, the DVD captions (made 50 years after the film) show it as Donner (German translation). Both names are commonly used in popular culture.
When Kris is finishing up his examination, Dr. Sawyer is portrayed in a combination of three camera angles. As the angles change his hands go from raised above the desk to palms down on the desk to folded on the desk. The hands change positions continually throughout the scene.
While prosecutor Mara is making his final arguments to the
Judge, defense attorney Gailey is out in the hall presumably talking to the postmen. Gailey returns to the courtroom just as Mara finishes his statement. No judge would allow final arguments to proceed in the absence of the attorney for the opposing party.
After Kris is accused of being mentally ill but before his hearing occurs, newspaper articles are shown on the screen. The headlines say that Kris will have a hearing, which is correct. But the articles say that the hearing has already occurred, and describe what happened in the courtroom. Yet that has not happened yet.