Alright, so I spent the first half of today watching the DVD, then the VHS from '89 (taking notes), then going back to the DVD and skipping directly to the scenes.
There are no differences.
The only things I wrote down in my notes were small scenes where I couldn't really remember them being in the DVD, but upon watching the DVD again I confirmed that they were in both the DVD and VHS. Such as when Littlefoot, Cera, and Sharptooth all fall off the cliff, I could have sworn that the scenes were a bit longer in the VHS, but I don't think they are after going back to the DVD.
When sharptooth jumps on LF's mom's back, it isn't in shadow.
Unfortunately I have to say that the attack is seen in shadow in both the DVD and VHS. However, you all may be forgetting that in both releases, there is a very brief shot of Sharptooth landing on LF's mother's back and getting ready to bite, right before the shadow shot. But everything else is the same. No berry scene, no mirrored shots, and Sharptooth's death is the same length.
Sorry guys.

But FYI; if you want to check for yourselves and aren't sure which VHS to get, look at the barcode on the side of the case. The UPC is 047897808647 (Hope that's okay to share).