Revealing mistake: After Max the dog breaks free from the cage and then bites through Callahan's chains, the two head to the metal barred window and Max begins pulling on one of the bars with his teeth. Which are obviously rubber, as they 'bend' slightly as the dog is pulling.
Revealing mistake: The wires holding the small satellite the two alien men are 'channeling' across the lake are visible although it's supposed to be floating.
The Return of Bigfoot: Part 2 - S2-E1
Revealing mistake: Bigfoot's face should be covered in hair, like the legendary Sasquatch, but is instead poorly covered in patches of black, with streaks around his eyes, the tip of his nose, and his lower cheek, And no paint on his white lips. And his eyes should have been camouflaged with black lenses. (00:17:45)
Revealing mistake: When the senator and his wife are trapped under the rubble, she is holding a burning candle, it looks like there are flames coming from her thumb. An obvious reflection off either the camera lens or that the candle is safely inside a glass tube so that she doesn't burn her hand.
Revealing mistake: Jamie prepares to split a giant heavy log in two, with her bionic arm, so that it will fit into her fireplace. Just as her arm comes down, you can see the middle seam where the log was pre-cut for the shot, so that it easily breaks in two. (00:00:30)
The Pyramid - S3-E13
Revealing mistake: As Jaime starts 'cutting' along the window with her bionic fingernail, the precut outline is quite visible from the sides, and her left hand is resting on the ledge of the first hole she cut, to give her leverage. Which would be impossible for her to do, as it's raw glass and would leave bleed marks on her hands. (00:34:30 - 00:35:20)