>>7
Granted I haven't read the old versions, but you have to keep in mind that in some cases the versions you're thinking of don't even exist. The newest one is full colour (meaning house is in blue, sections related to the minotaur are in red and there is one purple word), but I seriously doubt you will have much luck finding previously published copies anyway so that is what you're 'stuck' with... even though it is a good thing.
Also technically the newest version has an extended index after the book, including many letters from Johnnies mother and some full colour pictures.