Continuity mistake: When Dr. Sawyer is giving Kris the exam, during the part where Kris is doing the physical coordination test, we see Kris from Sawyer's point of view, and Sawyer is drumming his fingers. When the shot switches to Kris's, he is fingering his eyebrow. When it switches back, fingers drumming. Finally, when it switches back again, his hands are neatly folded in front of him.
Visible crew/equipment: When Kris is being taken to the court house, when he meets Alfred before getting on the elevator, the camera pulls in for a closer angle, and you can see the camera mobile's shadow on a pillar to the left.
Other mistake: The traveling camera used during the opening credits is not positioned correctly; it is tilted to the right, causing the whole scene to be crooked.
Character mistake: In the scene where Kris's knowledge is being tested, he incorrectly gives the vice president of President John Quincy Adams. Kris states John Quincy Adams' vice president was Daniel D. Thompkins. That's wrong. John Quincy Adams' vice president was John C. Calhoun. Daniel D. Thompkins was the vice president under President James Monroe.
Other mistake: Mrs. Walker is introduced as Karen Walker a few times in the movie. When she signs her name on the letter to Kris Kringle she puts Doris, the actress' real name. Not once in the movie is she ever called Doris. Just Karen.