Page 126. " six track seventy millimetre "

Arthur is drawing a parallel between the full immersion experience of the Sens-O-Tape recording and 70mm wide-screen motion pictures with six track sound recording, a  recording system which was state of the art in 1979.

Page 128. " Forty two, said Deep Thought "

As an answer to "the meaning to life, the universe and everything", this has sparked a great deal of speculation over the years.

GNU Free Documentation License42

Douglas Adams had this to say about it:

"The answer to this is very simple. It was a joke. It had to be a number, an ordinary, smallish number, and I chose that one. Binary representations, base thirteen, Tibetan monks are all complete nonsense. I sat at my desk, stared into the garden and thought '42 will do.' I typed it out. End of story."

Page 136. " careless talk costs lives "

This is a reference to a series of famous British Second World War propaganda posters, exhorting the public not to discuss sensitive information about the war effort in public. 

Two Examples

Page 142. " How many roads must a man walk down? "

A line from the song Blowin' in the Wind by Bob Dylan.

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Page 149. " the Restaurant at the End of the Universe "

The Restaurant at the End of the Universe is the title of the next book in the Hitchhiker's series.