Although Buddy Hackett was cast as the father of Christopher Dark and Warren Oates, he was four years younger than Dark and only four years older than Oates.
During the gunfight in the salt mine, the Malakies fire off 19 rounds without reloading their pistols holding 6 rounds each. Marshall Torrance gets at least 4 shots off on his double barrel shotgun without reloading.
Though filmed for the time period of the 1880's, Lucas McCain is wearing Wrangler jeans that weren't invented until 1904