The Night of Miguelito's Revenge - S4-E12
Continuity mistake: A man and woman walking in the background as Pike is being gassed are about to cross the street at a corner. As Pike is being lifted into the carriage, the same couple are just about to approach the same corner.
The Night of Miguelito's Revenge - S4-E12
Revealing mistake: The steam-driven robot controlled by Dr. Loveless blinks as he is strangling West.
The Night of Fire and Brimstone - S4-E9
Factual error: West fires seven rounds from his six-shooter without reloading to cover Gordon's escape.
The Night of Fire and Brimstone - S4-E9
Continuity mistake: After West shoots the mine wall with the grappling arrow, the line connected to the arrow is taut. The quick shot back to West shows the line loose with lots of slack, then cuts back to the arrow and the line is taut.
The Night of the Fugitives - S4-E7
Continuity mistake: West uses a chandelier to knock down a thug wearing a brown vest against the opposite wall in the Saloon. When West gets up, the thug is now lying next to West and wears a green vest rather than brown, and is also closer to the Saloon's bar.
The Night of the Fugitives - S4-E7
Continuity mistake: David Desmond's cigar instantly changes from being elevated in the facial close ups to being at a lower angle in the shots from behind his right shoulder.
The Night of the Fugitives - S4-E7
Continuity mistake: Monk sees West in a mirror escaping from behind the hotel's door. The immediate next shot shows West escaping again.
The Night of the Fugitives - S4-E7
Revealing mistake: Ross Martin's stunt double is obvious after Hallelujah Harry's coach begins exploding. The stunt man looks nothing like Martin and has an obvious bald spot on his head, whereas Martin did not.
The Night of the Kraken - S4-E6
Continuity mistake: When Jose' Aguila pulls down the net, he is in front of the bar. The next shot he is instantly punching a bad guy in front of a window, which is several yards from where he was at the bar.
The Night of the Kraken - S4-E6
Continuity mistake: During the bar fight, Aguila and the goons he is fighting disappear from the scene, showing only West fighting some bad guys. Instantly Aguila appears in the exact same area where West was fighting.
The Night of the Kraken - S4-E6
Other mistake: While walking on the waterfront after the bar fight, West and Aguila's clothes are dry where moments before they dove out a window into the ocean.
The Night of the Kraken - S4-E6
Continuity mistake: While struggling under water with the kraken, West surfaces, then the next shot shows West deep underwater and breaking the surface again.
The Night of the Gruesome Games - S4-E5
Revealing mistake: The guide wire of the knife Dr. Raker throws at West is visible, as is the hole in the wall where the knife point lands.
The Night of the Gruesome Games - S4-E5
Visible crew/equipment: A film crew member's shadow is visible to the left in the scene of West getting his horse back on its feet.
The Night of the Big Blast - S2-E4
Revealing mistake: The face of the stuntman playing the bomb-carrying Artemus Gordon double is obvious, and looks nothing like Ross Martin, who plays Gordon.
The Night of the Watery Death - S2-E9
Continuity mistake: The knife West uses to throw at the button to turn off the disintegration machine is already embedded in the button before he throws it.
The Night of the Bars of Hell - S1-E22
Continuity mistake: Artie inspects the electrical panel on the wall and the throw switch is at a horizontal position. A quick cut later and it is at a slightly lower angle.
The Night of the Raven - S2-E3
Continuity mistake: West enters through a bedroom window that, from the outside, is dark inside, but when he climbs in, the room is now brightly lit.
The Night of the Raven - S2-E3
Revealing mistake: The strings used to move Dr. Loveless' plants are visible.
The Night of the Raven - S2-E3
Revealing mistake: In the pit with West and Princess Wanakee is a cat that is obviously superimposed into the scene, as West and Wanakee cast stark shadows, but the cat does not.