Other mistake: When Ferris first arrives in the town the the church bell chimes seven times indicating it's 7 o'clock. Later the bells chime again but this time only four times indicating 4 o'clock. Surely he didn't walk around the empty town for 9 hours.
Suggested correction: Since the revelation of the episode is that Ferris is merely in a simulation, it stands to reason that they control how quickly time passes for him.
Other mistake: When Mike first walks into the town he sees the ringing church bell then looks to his right. The camera acting as his POV pans from left to right but since he was already looking to his right then the camera would be facing the direction he just came from.
The Lonely - S1-E7
Other mistake: The supply crew arrives at the asteroid every 3 months, as established by the dialogue between Corry and the astronauts who bring him the female robot. However, Corry's narration reveals that he has been living with the robot for 11 months when the next supply ship arrives.
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.
Other mistake: Lt. Mueller's German accent drifts in and out.
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?
Other mistake: Helen is holding the cup of rich "cocoa" that Markie supposedly just drank. Helen says, "I thought she'd finished her cocoa, and here it is untouched." Close-up on the "cocoa," which is clearly (so to speak) nothing more than water. (00:12:10)