When Baron is pointing the revolver at Ricky Joe, he cocks the hammer back but in the next close-up of the gun, the hammer is still forward.
Big Mama's branding iron couldn't be made red hot by holding it against a little travel iron that couldn't get red hot itself. To brand human skin, an iron doesn't have to be red hot any way nor does it have to be held against the skin for more than a few seconds.