Well, simple way to determine it, check the running time. A show of that era would come in around 48 minutes. If it doesn't, then its been tinkered with.
Maybe because everything that Cannell releases is a butcher job with all of the music replaced, episodes hacked up, syndicated versions, etc. Really nothing to get excited about. When it comes to Cannell shows that I care about, I would rather lose a little quality and just transfer my VHS SP...