Yes I did that, now I can get to about 979,000 studs,so I'm close
Some of the things I could be missing are...
That train track trailer(I put the box thing on it),That plane thing with bat wings,the hole with grey lego parts in it(they don't jump around to build)next to the monkeys & where you build the flowers, the area where you build the trophy picture on the ground & the paturn pictures next to it and where you build those coloured letters around the level

Hope This Helps, Thanks