The Night of the Big Blast - S2-E4
Continuity mistake: While Artemus talks to Lily at her dining table, he clasps his hands behind his back and is standing up straight. When the shot cuts, he's suddenly leaning forward with his left arm extended to the table. (00:11:25)
The Night of the Big Blast - S2-E4
Revealing mistake: The "corpse" Miklos wheels into Dr. Faustina's laboratory is pretty healthy for a dead guy: you can see his chest moving up and down as he breathes. (00:27:00)
The Night of the Big Blast - S2-E4
Revealing mistake: During the sword fight on the stairs, Artemus' stunt double's face is in plain view in several shots. (00:30:00)
The Night of the Big Blast - S2-E4
Visible crew/equipment: At the end of the sword fight, the moving boom shadow is visible on the balustrade at the right of the screen. (00:30:05)
The Night of the Big Blast - S2-E4
Continuity mistake: The large black straps hanging off the sides of Dr. Faustina's medical table disappear when West and Gordon burst into the lab. (00:44:00)
The Night of the Big Blast - S2-E4
Visible crew/equipment: The boom mic's shadow is visible as Lily Fortune and her mom enter the parlor of West and Gordon's railroad car.
The Night of the Big Blast - S2-E4
Revealing mistake: It is obviously a dummy body that West and Gordon net, then drag behind the carriage before the dummy body explodes.
The Night of the Big Blast - S2-E4
Continuity mistake: Halfway between the opening credits and first freeze frame, Gordon and Ms. Lily Fortune are seen entering the private train car in the dark of night, but the shot before their entrance is of the front of the private train car at twilight. That shot of the train car also shows a backwards number 3.
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 Big Blast - S2-E4
Other mistake: After Artie and Mr. Peters leave the Fortune ladies at their table, Artie continues walking even after the Mardi Gras mask he is wearing falls off.