The Praying Mantis KillsGoofs
Continuity
The windows of the Sheriff's house are shot out during the gunfight, yet the night after they are fully glazed again.
Revealing mistakes
When Caine frees Hap from the burning Jail and a fight ensues, Caine knocks him out and slings him over his shoulder to carry him out. The "unconscious" Hap can be seen patting out a small fire on Caine's jacket.
Anachronisms
In the final scene a power transmission line can be seen on the mountain in the background as Caine walks away.
After the miners are rescued a jet contrail can be briefly seen behind one character's head in a close up.