The Night of the Bubbling Death - S3-E1
Factual error: The skeletons in the dungeon hanging from shackles and standing upright in cages would have been piles of bones on the ground due to cartilage and tendons decaying, which hold bones together.
The Night of the Firebrand - S3-E2
Factual error: A modern warehouse-type structure is seen in the background as West rides into Fort Savage.
The Night of the Firebrand - S3-E2
Factual error: The amount of explosives detonated in the wagon should have blown it to toothpicks, not left intact with just the canopy blown off.
The Night of the Circus of Death - S3-E9
Factual error: At the mint, Arte hides in a broom closet. He carries nothing in (nor did he hide anything in there beforehand), yet he emerges later in an "old man" disguise, wearing a wig, hat, mustache, false nose, glasses and janitor costume. Magic closet? (00:35:00)
The Night of the Turncoat - S3-E13
Factual error: Artemus Gordon is standing in the train car throwing plastic darts. Plastic wasn't invented then, it would have been natural feather.
The Night of the Arrow - S3-E16
Factual error: The soldiers toss Artemus into the cell, slam the door and walk away. But they never produce a key or lock the cell door. He's somehow locked in anyway, though. (00:24:30)
The Night of the Underground Terror - S3-E19
Factual error: The episode opens in New Orleans during Mardi Gras, circa approximately 1873. We hear a jazz band playing "When The Saints Go Marching In" although the song didn't emerge in a recognizable form until the end of the 19th century. (00:00:19)
The Night of the Underground Terror - S3-E19
Factual error: The small round table in West's railcar parlor has a flip-over top, with secret maps hidden on the underside. The wine decanter and glasses all stay attached when it flips. But impossibly, when West turns the tabletop back over at the end, there's a full cup of coffee sitting on it. (00:48:30)