I wish I had...I did see it air there occasionally (the problem with Cartoon Express was that much of the time, I didn't know what shows were going to air when) and I definitely did see a version of the show closing on at least some episodes which had Scooby Doo's and Dynomutt's faces. That isn't on the DVDs. By the way...the Dynomutt shows on the DVDs are about three minutes shorter than the Scooby episodes. 21 minutes just seems too short...something's gotta be missing...Hong Kong Phooey is like that too...I can't swear to this (by the mid-70s I really wasn't following H-B all that closely) but it sure seems likely.
That DVD set features the same battered old prints shown on CN and Boomerang. They could've at least restored them and reinstated the laugh track on those...
So what are you saying...just put out the Scooby Doo episodes and not Dynomutt? (Releasing it the way they did is probably the only way Dynomutt would have gotten out at all.)