Revealing mistake: When the Apache war party starts its charge toward the High Chaparral, the dirt road beside them shows clear tire tread marks from the camera truck. (00:30:05)
Revealing mistake: The square base securing the knife sticking out of the abdomen of the army lieutenant is visible as he and Blue scuffle in the river.
Revealing mistake: The substitution of a "stunt horse" is noticeable here when Blue is thrown during an Apache attack. Before he falls off, his palomino horse has its usual blond mane and tail. But when the horse rears and he falls, it's another palomino with a grey mane and tail. The blond one is instantly back, though, when Blue gets up.
Gold Is Where You Leave It - S1-E19
Revealing mistake: Buck lights the fuse and tosses the dynamite-filled barrel at the bad guys. We see the explosion. Unfortunately, after that, we can also see the intact barrel still rolling away in the dirt.
Revealing mistake: At the end, El Tigre (Ricardo Montalban) is supposedly dead, draped over the horse as his brother leads them away. However, his right foot is in the stirrup, and it is obviously holding his weight...not dangling as the rest of the "corpse"
Revealing mistake: When Blue rides in with Moon Fire and Kelly, there are footprints visible in the dirt behind them. Several of the prints have distinctive patterned tread from what could only be 20th Century rubber-soled shoes.
Revealing mistake: Henry Darrow's stunt double is very noticeable during the final fight scene with Ramon. He's heavier, taller - and is wearing a very bad wig. (00:44:30)