Tooth and Consequences - S1-E41
Revealing mistake: The glue holding the mustache to actor David Birney's (Dr. Myron Mandel) upper lip is visible.
Continuity mistake: The pizza crust in Toby's hand keeps changing positions depending on the angle of the camera shot as he talks with Mr. Bendictson.
I of Newton - S1-E29
Revealing mistake: Set lights are visible in the Demon's sunglasses while he is wearing them and when he is not.
I of Newton - S1-E29
Visible crew/equipment: A boom mic dips into the scene during Sam and the demon's conversation in the classroom.
Continuity mistake: At the cocktail party, Ettinger and Bacchus are sitting with their shoulders touching in close-ups, but they're more than a foot apart in all the full shots. (00:07:05)
To See the Invisible Man - S1-E40
Continuity mistake: In the cafeteria, the "invisibility" mark on Mitchell's forehead has moved to a higher spot than it occupied in previous scenes. (00:05:00)
To See the Invisible Man - S1-E40
Visible crew/equipment: When the woman ignores Mitchell and rushes into her apartment building, the glass door she opens reflects the camera, crew and studio lights. (00:06:20)
Other mistake: Veteran actor Elisha Cook's name is misspelled "Elisa Cook" in the opening credits. (00:01:00)
The Little People of Killany Woods - S1-E34
Visible crew/equipment: When it's opened for Mulvaney, the hardware store's glass-paned door reflects several large, round studio lights. (00:06:05)
The Beacon - S1-E26
Plot hole: Barrows introduces himself as "Dr. Dennis Barrows," and Teddy asks, "What's a doctor?" As the isolated villagers have never heard of doctors, Teddy would have no way to know that "Doctor" was a title/profession and not simply part of Barrows' name. He should have asked, "What kind of a name is Doctor?"
Answer: Poisoned food, heart attack from eating too much food, or he slipped in the shower. The list is endless.