I had forgotten this gem
Recently I saw the cover artwork for the Goodtimes Video, and it triggered some long dormant memories. I'm pretty sure I watched this on TV growing up in the Detroit area, but I don't recall what show it was on.
So I watched it again. I was dinosaur crazy as a kid, so the scenes that really brought it back for me involved the dinos. Particularly that shot of the four boys looking across the river as the T Rex and Stegosaurus fought. And them examining the fallen dinosaur's carcass. Great stuff.