Other mistake: If the crystal cracked on his pocket watch, why didn't his glasses crack, too?
Other mistake: Bemis is happy because he has enough time to read all he wants, but all the food would be poisoned by the radiation and and even if it wasn't, meat and fish it would spoil from not being refrigerated.
Continuity mistake: In the vault, the book Mr. Bemis puts down flips open a moment before the atomic blast. After the explosion, the book is closed again.
Revealing mistake: When Hall races toward the window to jump, the stunt man is just a little too apparent as he leaps, primarily due to a very bad wig. (00:22:40)
Continuity mistake: Hall leaps through the plate glass window. In the interior shot, he breaks the glass and is 3/4 of the way through the opening (up to his knees) - until we cut to a view from outside the window. Then he's just crashing through at shoulder level. (00:22:45)
Revealing mistake: When Lanser goes below deck frantically trying to find people and tell them to leave the ship, when he opens the door at end of the corridor, it's a bit too obvious that the hallway behind that door is nothing more then just a painting.
Other mistake: Lt. Mueller's German accent drifts in and out.
Revealing mistake: When Lanser drops the cup, you can quite see that he is drinking from an empty cup, since the steward never poured him any and yet he manages to get some of it on his suit.
And When the Sky Was Opened - S1-E11
Revealing mistake: After his flashbacks in his hospital room, Forbes looks at himself in The Mirror and he cannot see his reflection. But you can still see his arm in mirror.
Continuity mistake: Renard gets his bottom wet from sitting down and tying his laces on his new shoes. But after he is hit by the car, his trousers are dry.
Revealing mistake: In scene just after Rod Serling's opening narration, you can quite see that scene is being played in reverse because smoke is coming downwards back into the man's cigarette.
The Four of Us are Dying - S1-E13
Revealing mistake: As the men walk out of the alley, the block continues ahead of them. You can see it's a painted background.
The Four of Us are Dying - S1-E13
Visible crew/equipment: As Arch Hammer is walking to Hotel Real, the camera is looking up towards him as he walks. Just before he turns to go in, the lights, roof, and support beams of the soundstage are above the skyline backdrop.
Continuity mistake: No one drinks much lemonade, so there's neither time nor need for Eve to refill the pitcher during the brief cut to a scene on the porch. Yet after she has emptied its contents into the glasses on the tray, the lemonade pitcher refills itself. (00:15:15 - 00:19:10)
Visible crew/equipment: Right after the phone conversation, everybody starts going towards the door. As they do, if you look at the couch on left you can very briefly see a shadow of something moving across it. It couldn't be any of the actors since they were all either outside or on the other side of couch.
I Shot an Arrow into the Air - S1-E15
Other mistake: Corey sees a sign for Reno Nevada that is in the middle of nowhere, that can't be seen from the road in the distance. Who would see it?
I Shot an Arrow into the Air - S1-E15
Revealing mistake: Right after their friend dies and the commander talks about going into the mountains to search for any life signs, you can very briefly see Corry looking straight into the camera.
Continuity mistake: When Nan first swerves to avoid The Hitch-Hiker, her 1959 Mercury briefly turns into a 1957 Ford. It also changes from a light to a dark color. (00:17:15)
Continuity mistake: After Nan sees Hitch-Hiker for first time and she starts speeding away, she has clear road both in front and behind her. But just seconds ago, a mechanic told her to follow him to his shop so he could change her tire. Where did he go?
Factual error: The Southern Pacific train that almost hits Nan's car did not serve the part of the US she was supposed to be in.