The Set For Alice in Wonderland
It is not unusual for films to be made entirely in CGI. Take the Alice in Wonderland movies for example. The only thing that stayed the same from the set to the final cut was the dress!
It shows the talent of both the editors and cast members. That’s dedication if we ever saw it.
The Rapids In Oz the Great and Powerful
There are times when scenes are simply too dangerous to enact in real life. If you want an example, look at the rapids scene in Oz the Great and Powerful.
The actor was actually in a moving rig that simulates the choppy effects of the water. They used the blue screen here!