Factual error: When Bob Ford opens the box under the bed, on top is an issue of "The Jesse James Stories" weekly, which was published from 1901-1903 - fully twenty years after the events of this film.

Factual error: At the beginning of the movie, in the conversation betwenn Frank James and Robert Ford, the term "gunslinger" is used a few times. However, the term "gunslinger" didn't come into use until the 1920s (the movie is set in the 1880s).

Continuity: During the conversation between Jesse James and Charley Ford after James has killed Ed Miller and woke Charley in the middle of the night, Charley's right suspender is initially twisted, yet, in the next shot his suspender is flat against his body, and remains so for the rest of the sequence.

Continuity: While Dick Liddle is talking to Robert Ford, Ford's hair is curled to his left, yet in one shot during the sequence, Ford's hair is straight, then goes back to being curled the rest of the sequence.