Willie Nelson was 53 when the movie was released. The real Doc Holliday died when he was just 36.

Willie Nelson, Waylon Jennings, Johnny Cash and Kris Kristofferson recorded several albums between 1985-95, as The Highwaymen.

The role of "The Ringo Kid" was originally to be played by Waylon Jennings, but the producers determined that Jennings wasn't up to the demands of the part and cast Kris Kristofferson instead. Jennings was given the part of "Hatfield" instead.

The film's cast includes four Academy Award nominees: Willie Nelson, Kris Kristofferson, Anthony Newley and Anthony Franciosa.

The film takes place in 1880.

Continuity

Early in the trip the coach driver and the sheriff take turns with the reins long enough for each to remove his coat. The sun is getting brighter and the idea is conveyed that it is getting warmer. Then, there is a scene, maybe when they pick up Ringo, when their coats are on their bodies again. However, immediately after that their coats are once more off.

When the group is deciding whether or not to go on to Lordsburg from Apache Wells, The Marshal's Stampede string on his hat changes sides. The angled support beam on the door behind him changes directions as well. The film was obviously printed in reverse for one part of the scene.

Many scenes that are depicting the same time and place have totally different sky conditions. Some are clear blue others are completely overcast of mostly overcast.



Anachronisms

Fifteen minutes into the movie there is sign that shows Marshalls office, there is no apostrophe.