Red Dwarf
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Suggested correction: Unfortunately, we don't have enough information about the JMC uniform regulations to know if it's required that long-service medals must be worn on ceremonial uniforms. It might be optional.

Backwards - S3-E1

Other mistake: It is established in the backwards version of Earth, that all writing is reversed and is spelled backwards. However, there are some inconsistencies, as in some instances the writing has been mirrored to appear reversed, whilst in some instances the writing has just been spelled out backwards. For example, car number plates and signs on display in the background have been mirrored to appear reversed, but the newspaper that Kryten reads, the Nodnol sign and the Sensational Reverse Brothers poster appear normally typed out, and not as the mirror image that other aspects of this world have.

Casual Person

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Suggested correction: Kryten can, and does, eat and drink. For example, in "Gunmen of the Apocalypse", he is eating a bowl of coffee grounds, and in "Back to Earth", he eats what seems to be a form of "mushy" food. In The Last Day, Kryten gets drunk from drinking the "special brew" Holly made for him.

Bodyswap - S3-E4

Other mistake: When Lister inadvertently sets off the Auto Destruct sequence, the computer voice says the ship will detonate in 15 minutes. The computer then says "the ship will detonate" every five seconds followed by how much time until detonation, but the time in which the computer says this is inconsistent. Two seconds after the computer says 15 minutes, the computer says the ship will detonate in 14 minutes 55 seconds. Ten seconds after saying that, the computer says the ship will detonate in 14 minutes 50 seconds. (00:01:50)

Casual Person

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Suggested correction: He keeps hitting it to cancel the self destruct, which then speeds up the countdown.

The mistake occurred before Lister touched anything and isn't about the obvious jump in the time left. 5 seconds taking 2 seconds and then 10 seconds is the mistake.

Bishop73

The system's malfunctioning. Being inexplicably inconsistent is very appropriate, not a mistake.

Season 2 generally

Other mistake: The shots of Blue Midget driving back to Red Dwarf that are shown from behind are visibly the exact same shots used each time. This is evident as the driving movements of Blue Midget, its position in the frame, and Red Dwarf's position in the background are all identical each time.

Casual Person

Cassandra - S8-E4

Other mistake: Cassandra says that all the canaries will be dead in 1 hour, with the exception of Rimmer, Kryten, Lister, Cat and Kochanski. However, Kill Crazy was still knocked out in the transport vehicle and presumably would have survived too.

Padzter

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Suggested correction: But Cassandra was known to lie if it suited her purpose, she said that Lister would harpoon Arnold through the head and kill him but that's not what really happened either.

Yes, Cassandra lied about Lister shooting Arnold through the head with a harpoon, but that was an attempt to stop Lister from killing her. Mentioning which of the canaries will survive had no impact on any of her plans, so not mentioning Kill Crazy survived is still incorrect on her behalf.

Kill Crazy was safe in the transport vehicle, so wouldn't be affected by the station flooding. Mentioning him would have been irrelevant.

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Suggested correction: How is this a mistake? It isn't known that every Felis sapien from 3 million years of evolution must have fangs.

Camille - S4-E1

Other mistake: When Kryten and Camille are having dinner, Camille puts her "hand" in the soup and begins slurping it up. The level of soup remains the same and doesn't lower despite being slurped. (00:22:25)

Casual Person

Backwards - S3-E1

Other mistake: When Rimmer is testing Kryten on a book of space traffic signs, Kryten stops on one page and is tested, which he says the sign is a binary star. Without turning the page, Rimmer points to a second sign on the same page asking what it is, which he points out is a blue giant about to supernova. After pointing to the time hole, Rimmer turns back to the book, saying "Right. What's this?" whilst still on the same page, pointing to a another sign. The page that is being used has one sign shown on the right hand side page, and the left hand side page is completely blank, equalling one sign on both sides of the page, but two or three signs are made mention to when on the page. (00:05:20)

Casual Person

Bodyswap - S3-E4

Other mistake: When the group are discussing if they can override the Auto Destruct, the computer voice says 8 minutes 20 seconds until detonation. About 20 seconds after saying this, the computer voice then says 8 minutes 10 seconds until detonation. (00:02:35)

Casual Person

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Suggested correction: This isn't a mistake; the system is malfunctioning. Getting the time wrong is very appropriate.

Future Echoes - S1-E2

Other mistake: When Rimmer is doing Lister's memo, there there are only about a few stars visible out the window, which is far too few given the amount of stars shown in exterior space shots of the ship. Additionally, a star suddenly appears in the window. (00:23:15)

Casual Person

Future Echoes - S1-E2

Other mistake: When the Cat says there better be no dogs on the ship, there are only about two or three stars visible out the window. Far too few given the amount of stars shown in exterior space shots of the ship. (00:05:15)

Casual Person

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Suggested correction: They aren't stars; it's dust on the window... (a reference to a later episode).

Back To Reality - S5-E6

Factual error: While it is true that lithium carbonate can be used to treat depression and other psychiatric disorders, it cannot be administered in gaseous form. It is a very stable salt and only starts to form vapour at 1,310 degress Celcius. Spraying it about as a 'mood stabliser' at that temperature, as Kryten does, is going to kill everyone on the spot.

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Trivia: The actor who plays the original Kryten, in 'Kryten', also turns up later as the voice of Talkie Toaster.

More trivia for Red Dwarf

Meltdown - S4-E6

Question: When Kryten and Rimmer were doing the roster of their ranks, Why did Kryten skip the old woman in the black dress with the white shoulder sash between Dali Lama and Mr. Noel Coward?

Answer: It's Queen Victoria, someone any Englishman would recognize, and needed no introduction.

Kryten was introducing the "people" to Rimmer. Rimmer isn't an Englishman; he's not even from Earth; he's from Io.

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