Sorry, avidfilmbuff, but this is incorrect. There are
at least 5 shots which use CG replicas of actors.
-the Russians in the CG car when it becomes consumed by the shock wave.
-the long shot of the Russians on the cliffside.
-Indy & Co. falling out of CG the amphib when it goes over the falls (not sure on this one but would seem likely).
-the Russians getting pulled into the portal.
-Flying Mac when he gets sucked away back into the throne room.
As you said, "if you don't believe me then watch the special features".
Other uses of CG elements are the jets flying overhead, the bending tree, Indy's ant-ridin' fedora and digital face replacement during the motorbike chase.
It's exactly 2 years after the release date and people are still b*tching & moaning over "Skull"! You guys make me laugh.
While I'm in this thread, let me say that the worst scene in Indy 4 is the sandpit/snake gag. A cringe-worthy moment for me but 2 years ago today, the audience was laughing (where I was, anyway).