Revealing mistake: Tony throws two knives at West - but on the wall where the knives hit, the rectangular openings from which the blades actually emerge are delineated beforehand. Happens again a few scenes later, where slots cut in the door are already there before the knives are thrown. [Spoiler: It's inconsequential to the "revealing" error, but if you play the scene in slow motion, you can see that both times, the knives pop through from the back of the "wall." This is also how the carnival trick is performed.] (00:17:05)
Revealing mistake: Mr. Braine fires a mini-rocket at Brendage, killing him. But a poor camera angle reveals the explosive charge going off in the wall more than two feet to Brendage's left. From the angle at which it was fired, the rocket couldn't possibly have hit him. (00:21:45)
Continuity mistake: West and Gordon drag Day from the haunted house, prop him on the porch and turn away. When they turn back, they're stunned to see that he's aged 30 years. But if you look closely, you can see that the man they prop on the porch is already gray-bearded and shaggy. So why were they surprised? (00:44:30)
Revealing mistake: When the townspeople spill out onto the town's streets after hearing the noise from the sky, the horses tied at the hitching posts never move nor flinch through the entire scene and are all in the same pose, indicating the horses are props and not real.
Continuity mistake: The opening scene of this episode shows the train moving at twilight. West and Gordon are looking out the window, and it is pitch black. Right before West goes outside, the camera shot of the train wheel shows light (either twilight or moonlight) on the wheel. The very next scene has West with the train door open, and it is pitch black outside. (00:00:05 - 00:00:35)
Character mistake: There are seven mourners dressed in black surrounding Gordon's casket - three on each side and one by the funeral officiator (who is the disguised Gordon). Later in the scene when West is talking to the disguised Gordon, Gordon says, "How do you like that - six mourners..." (00:05:20 - 00:07:10)