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SEASON ONE - 2, 3, 4, 5
WHERE IS EVERYBODY? MR. DENTON ON DOOMSDAY WALKING DISTANCE
While Ferris is talking to the mannequin, a fly appears, lands on the car door and takes a break. There's some radio towers in the upper left hand corner of this screen, out of time with the old west. Martin reaches for a dime in his pocket while the camera is behind him.  He's then sitting normally when the camera's at a front shot, but a few seconds later he reaches into his pocket for the dime again.

 

WALKING DISTANCE THE LONELY TIME ENOUGH AT LAST
Martin sees his younger self carving the first letter of his last name, "S", on the Gazebo. In the next shot, younger Martin is still carving the "S" but the next letter, "l", is carved as well. In the next shot the "l" isn't carved yet.

 

Even though Corry is on an asteroid devoid of any life and nine million miles from Earth, a bird flies through the sky in the final frames of the episode..

 

Helen rips out about eight or nine pages from Henry's book. Henry moves down to the floor to pick them up, but when he reaches the floor there's about thirty pages scattered around.

 

JUDGMENT NIGHT WHAT YOU NEED THIRD FROM THE SUN
The Queen of Glasgow is a British ship, and the life preservers which read "S.S." should be "R.M.S." In the final three seconds of the intro, Fred Renard's smoke from his cigarette is moving backward towards the cigarette.

 

Jerry Riden says they're 11 million miles away from Earth, which puts them between Earth and Mars or between Earth and Venus (about 24+ million miles away).

 

THE LAST FLIGHT THE PURPLE TESTAMENT ELEGY
Mackaye has his mouth open when he's looking up at Wilson but then he's looking down with his mouth closed.

 

Rod Serling's final narration includes a line from what he believes is William Shakespeare's 'Richard the Third', but it's actually a passage from William Shakespeare's 'Richard the Second.' - "He has come to open the purple testament of bleeding war."

 

The faces of the couple dancing in the hotel room are not in the same position in the close-up shot as they are in the medium shot. 

Wickwire states that the asteroid revolves around two stars which are 655 million miles from Earth. That would mean the cemetery is within our own galaxy. Also, after the astronauts had been traveling in space, they refer to a 'meteoroid storm' as a 'meteorite storm'.

 

LONG LIVE WALTER JAMESON PEOPLE ARE ALIKE ALL OVER EXECUTION
Walter Jameson reads an entry from the diary of Major Skelton (Jameson himself), dated Tuesday, September 11, 1864. However, September 11, 1864, wasn't on a Tuesday, it was on a Sunday. Also, in the end, the dust from Jameson's remains blows towards the open window instead of away from it.

 

When dead astronaut Warren Marcusson is carried out of the ship, he can be seen breathing. There's a rectangle shadow near Caswell's left knee that wasn't there when the camera was on Caswell's swinging legs. As Caswell's body disappears, the noose stops swinging, but when they cut back to the noose it's swinging again. Also, Caswell's legs start to rise a few seconds before the horse is slapped.
A PASSAGE FOR TRUMPET A PASSAGE FOR TRUMPET

THE AFTER HOURS

While in the Theater lobby, Crown finds that he doesn't have a reflection in the mirror. Just a few moments later, he rushes back over to the ticket lady and his reflection can be clearly seen in the glass of the ticket booth. While in the Theater lobby, Crown finds that he doesn't have a reflection in the mirror, yet his reflection can be clearly seen in the glass of the mirror.

Marsha carries her purse with her arm in the first and third shots, but in the frame between, her arm is not bent and the purse isn't there.
NIGHTMARE AS A CHILD
Right before Markie (Terry Burnham) delivers her speach about being Helen (Janice Rule) as a child, she can be seen mouthing Helen's dialog "Understand what?!"
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SEASON ONE - 2, 3, 4, 5