The extra 8kB was done to make a Spanish tax on home computers with 64kB of memory not apply to the 472. There was otherwise no difference with the 464.
Old thread now - but I just got this book and it's made my day! I'm of that vintage where my first coding was on a friends Nascom I (not mentioned in the book) but I really cut my teeth on the school's commodore Pet!
I remember looking at adverts for the SCMP and the MK14 with envy tho!
It mentions something like that in the introduction. It's like a choose your own adventure kind of book. There are also Easter eggs that no other chapters point to, so you have to find them in a different way. It also says you'll sometimes reach a dead end, in which case you'll have to backtrack and choose a different path. There are also subroutine chapters that end with a return instead of a list of next chapters.