One of the escaping prisoners is shot from behind and falls face-down. Although there is an exit wound in his right abdomen, there's no visible entrance wound in his back.
Pitman escapes from prison on a mule, which he trades in for a horse at the widow's ranch. Lopeman follows on a horse, and tells the widow he recognizes the mule she has as having been "in jail". But when Lopeman rides back after finding Pitman's body, it is loaded on a mule while Lopeman still rides his horse.
When Pitman is getting beaten up by three men in the prison yard during a heavy rainstorm, there is bright sunshine casting distinct shadows behind them.