I remember reading Spielberg saying while ago when the started shooting this film that they will not use any CGI. That couldn't be further away from the truth ,I mean almost the entire film is CGI. I thought the whole movie was joke to be honest, I mean come on, surviving nuclear bomb by hiding in fucking fridge. Also the ending was as far fetched as you can get. even for blockbuster movie, Reading people review on IMDB it seems almost everyone is disappointed by this film.
He didnt say that he wouldn't use it, but only use it in a non-invasive way i.e. minor things like wire removal or the odd digital backdrop.
The warehouse and motorbike chase look like they use hardly any CGI (except the the wide shots of the endless warehouse which are fine with me) and are all the better for it in my opinion.
However the jungle chase does use a lot of it. I'm pretty sure that none of it was shot on location, it all seems to be green screen or studio based. Its pretty good studio work admittedly, but there is always something a little 'off' so you can always tell its not a real environment. I think it would of made the world of difference if they'd just got a few second-unit, long shots of trucks driving through the actual South American rain forest.
I know its impossible to entirely shoot a chase of that scale in the jungle but a little more effort in making the backgrounds more convincing would of helped.
The one real bad shot is when Shia and Cate are sword fighting on separate moving vehicles. Its just so obvious that they are standing in front of a green screen with a some half-arsed fan blowing in their faces. Their trucks aren't not even bouncing a little as they would on a jungle track and it looks like they are not being knocked off balance. That's the shot that really took me out of it.
Also, IMDB and their "reviews" are probably the worst place on the internet to go for opinions on film. Its full of reactionary morons and kids, everything to them is "THIS ROXXXS!!!111!!" or "Teh MoViE sux". Stay well away from there mate...