Corrected entry: 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.
Corrected entry: 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.
Correction: 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.
Correction: 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.