Plot hole: "Showdown": Darien's lost hat and jacket reappear without explanation after Kane finds him wandering in the desert. Also unexplained is how Kane conveniently happens to be leading an extra, unnecessary horse - unnecessary, at least, until he stumbles across the stranded Darien.
Plot hole: "Cool Hand Darien": In the swamp, Luther overpowers both guards and escapes. As they were both out cold and no one else was around, he could easily have taken the keys from them and unlocked his leg shackles. Instead, assumedly because it's more dramatic, he sneaks back into the prison compound to steal a sledgehammer and break the chain.