Revealing mistake: Many of the "frozen" Union soldiers can be seen blinking, breathing and wavering in place amidst their regiment. (00:07:30)
The Jungle - S3-E12
Revealing mistake: The "mannequin" dressed as a warrior in the costume shop window is a live actor; watch closely and you can see his eyes widen ever so slightly. (00:14:55)
Revealing mistake: Stock footage used here is far too obviously borrowed from several old movies. While the episode is set in the 60s, people's clothing and all the cars are noticeably many years out of date. (00:03:05)
Hocus-Pocus and Frisby - S3-E30
Revealing mistake: Make-up for the space aliens was apparently changed after the closing scene in the store was shot and before any footage of the aliens' "true appearance" was actually taken. This resulted in Frisby, who is now telling the truth and finding no one to believe him, saying that the aliens had a single eye in their foreheads, when in fact, the aliens each had two eyes, in the traditional location. (00:24:00)
Revealing mistake: At the end, though Williams is shot multiple times (by several rifles, no less), there's not a drop of blood on him and no holes in his clothes. Also, his "corpse" is visibly breathing. He's clearly meant to be dead, so the fact that he's an alien with healing powers does not explain why he's still breathing - or why the bullets left no holes or blood on his clothes. (00:22:30)
In His Image - S4-E1
Revealing mistake: In the basement lab scene at the end, George Grizzard's double's face is visible in profile several times. (00:38:50)
Revealing mistake: We see Redfield's car strike the invisible barrier from a side angle. It jerks to a stop and the hood flies up, but there's no other front end damage - until the angle shifts to a forward view, a shot of an identical car that had been previously wrecked. Now there's suddenly considerable damage to the front end, and the hood is in a different, much more crumpled position. (00:11:10)
Death Ship - S4-E6
Revealing mistake: When Mason puts the ID card back into the pocket of his dead duplicate, the "corpse" twitches its eyelids. (00:14:30)
Of Late I Think of Cliffordville - S4-E14
Revealing mistake: When the camera is in a close up on Feathersmith's face, you can see the line of the skin wig he wore to be older.
Of Late I Think of Cliffordville - S4-E14
Revealing mistake: When the camera is in close up on Feathersmith, the line of the skin wig is clear.
Nightmare at 20,000 Feet - S5-E3
Revealing mistake: At one point, when the gremlin is about to rip open part of the engine, you can see he has a white sole on his foot, part of the costume.
Black Leather Jackets - S5-E18
Revealing mistake: The aliens cause a power fluctuation, and Mr. Tillman complains that all the lights in his house are flickering on and off. But the lamps in his living room are burning steadily. The "flickering" light is originating from what is obviously stage lighting above the set. (00:05:15)
Stopover in a Quiet Town - S5-E30
Revealing mistake: The actors are supposed to be in a play set for the huge child, but when she reaches down and picks them up it is obvious that it was filmed in an outdoor setting in a town much bigger than what is supposed to be the play set.
Mr. Garrity and the Graves - S5-E32
Revealing mistake: When the town's people are waiting for Garrity's arrival at midnight, we hear an old clock informing everybody it is midnight and they all turn around to see. But look at the time on the clock - you can quite clearly see that it is actually five minutes till 6 o'clock.
Revealing mistake: The strings on the guitar are extremely loose. While they would make a sound, it wouldn't be anywhere near the proper sound. The guitar sound throughout the episode doesn't match up to the strokes of the guitar either.