I think the general idea for Doc's being was to remain mysterious. Was he really the lone dinosaur? Does he really exist? Was it all just over active imaginations? Who knows! The concept was to keep Doc shrouded with a mysterious aura and I think that was done well. As much as he was on our screens, there still was no definite answer as to WHO he really was and what his true purpose for returning to the Great Valley was.
As for the ACTUALLY topic title, can't argue with what's already bin said. The CGI in LBT 10 was painfully, blatently obvious. It didn't blend in with the animation very well at all. Some of the camera pannings were good but apart from that...can't really defend the slap-dash job the CGI seems to present in LBT 10. As Malte has already said, the CGI adaptations made to LBT 9 are far more discreet and look better crafted. CGI, if added to a movie, should look as inconspicuous as possible but LBT 10 definitely doesnt cut it. I still enjoy watching the film, but I found it harder to notice the CG animated features of #9 then I did in #10.