Other mistake: When the Fellowship takes a rest after escaping the snowstorm, Gandalf and Aragorn begin arguing about which path to take from there. When Aragorn suggests the Gap of Rohan, Gandalf protests, saying, "That will take the Ring too close to Isengard," followed by "and Aruman" instead of "Saruman." (00:55:00)
Factual error: In the sixties retro scenes vehicles can be seen that didn't start production until the seventies.
Visible crew/equipment: When Travis and Jessie investigate what was reflecting sunlight, a Kodiak Bear attacks. When Jessie climbs a tree to get away from the bear, you can see a hand reaching down to help him get out of harm's way. (01:15:00 - 01:16:00)
Factual error: In the closing scene, E.J. Bellocq pictures Hattie and Violet with a Kodak Portrait Brownie No. 2. The Kodak Portrait Brownie No. 2 was not introduced until 1929, a dozen years after the movie takes place.