Fact: Anchor Bay has excluded original soundtracks on some releases for fear of people finding mistakes.
Well, it's a fact that Anchor Bay has excluded original soundtracks on some releases, anyway. What makes you think that the original soundtracks aren't included because of a fear of people finding any mistakes that may or may not be present? I'm not saying you're wrong (I have no idea either way), but that seems a little far-fetched. The number of people who would intensely scrutinize multiple soundtracks would seem to be so small as to be insignificant in the scheme of things, and anyone that determined could easily turn to other releases for a point of reference.
"When you're in your twenties, you wonder what everyone's thinking of you. When you're in your thirties, you don't care what people think of you. And when you reach your forties, you find out no one was ever thinking of you in the first place."