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Mistakes

At the point where someone gets a small bruise on the upper arm, the crew are all in a pile and thrashing about on the floor. There are 5 pairs of legs instead of 4. Arthur is in his pajamas, Zaphod is in orange trousers, Trillion is lying on top of Ford and Ford is too far away for them to be his legs. [The fifth pair of legs belong to the person playing zaphod's third arm - doesn't mean it's not a mistake, but that's where they come from.] See more...

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Douglas Adams makes several cameo appearences in the series. A drinker in the pub in part one, the man walking into the sea and a member of the Cirius Cybernetics marketing division in part two. See more...

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Season: Whole show  1  All

Episode 6 (series 1)

Arthur and Ford find the ultimate question by taking letters at random from a Scrabble set - spelling 'What do you get if you multiply six by nine' - and the words 'Forty' and 'Two' are already on the board. That is five Ys - and there are only two Ys in a Scrabble set. [They are playing with Arthur's homemade Scrabble set, not a standard one, so he could add as many of each letter as he wanted.]
Edit Corrected by Xofer
When Ford checks the escape pods, Zaphod is holding a shoe up, which you're supposed to asume is the end of Ford's leg. But you can see the inside of the shoe. What's more, when he drops it, you hear Ford fall but don't see him. [Ford's leg is there, it's just black so it's hard to see. And when Zaphod drops him, he throws him to the side.]
Edit

Episode 4 (series 1)

Before Zaphod, Arthur, Ford and Trillian enter the lift after talking to the mice, Trillian wears a dull red suit which hasn't been done up much. However when they leave the lift Trillian's suit is shiny and is considerably more done up. Her suit stays like this until in episode 5 after the book explains Milliways when it suddenly changes back. [She is wearing a shiney red jacket over the top of her spandex. As they land on the planet and are walking to the airlock on the ship, you can see her carrying it.]
Edit

Episode 3 (series 1)

After Arthur presses the "manual improbabilty control" button which disintegrates the missiles, Trilion is wearing red trousers. She was wearing a red skirt before Arthur pressed it. [The improbability drive didn't disintegrate the missiles, it turned them into a whale and a bowl of petunias. Changing somebody's clothing is relatively minor by comparison.]
Edit Corrected by Tailkinker

Episode 2 (series 1)

When Arthur and Ford get flushed out of the Vogon ship, the airlock's exterior hatch changes from a sliding design (as seen inside the airlock) to a hinged design. [Actually, it would make quite a bit of sense that there are two doors. If one develops a leak, the other can still keep the air in.]
Edit

Episode 1 (series 1)

How come all the people of Earth can correctly understand what the Vogon Captain is saying, while Arthur needs to put a Babelfish in his ear to understand it? [There is probably some sort of translator mechanism in the Vogon's PA system.]
Edit Corrected by Xofer