Since I made the posting above, I got the usual free month of Amazon Prime and was able to watch season four that way. (All the seasons are on Amazon Prime in Canada.) The copy which was coming from Nova Scotia, about as far away from BC as you can get, never showed up, curses. And following my viewing on Prime, I found a copy of the season in good condition in a local thrift shop, which contains all the extra features and commentaries on selected episodes, including at least one by "Boy Wonder," which you don't have access to when you are just watching the individual episodes on Prime. I have put further investigation of this season on hold while I'm working on the re-viewing of Classic H50 episodes, though.