** spoiler alert ** 
 Really liked the bit towards the end, when Arthur and Ford were on the ship full of loonies. When they crash-landed on the blue-green planet, I'd immediately suspected it was the Earth and the loonies were the ancestors of homo sapiens, and was able to pick up on all the satire/irony. Especially loved the scene where Ford tried to reason with them during one of their afternoon meetings. 
 One question though: six by nine isn't forty-two - is there supposed to be some meaning behind this? :/