Other mistake: In the opening song, the dolphins sing: "If we could just change one thing, we would all have learned to sing", however the subtitles on the DVD say "lungs to sing". As a side note, dolphins do indeed have lungs.
Continuity mistake: When Ford is drinking in the bar, the amount of beer in his glass goes down mid-drink.
More trivia for The Hitchhiker's Guide to the Galaxy
Question: Anyone who's read 'Life, The Universe & Everything' will now why the bowl of petunias thought 'Oh no, not again' just before it plummeted towards Magrathea, but had Douglas Adams already conceived that backstory and just couldn't fit it in to the narrative at the time or was it something he only came up with when writing part 3?
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Chosen answer: Because it was a radio show originally, Douglas Adams would write broadcasts from show to show. He did not know where something would lead, which let the plot become random and funny. So ultimately it was originally created to be funny, then he found a way to link it back in later.