During the Rancor scene, when a full frontal shot of it is shown as Luke tries to find a way out, you can see the puppeteer’s blue-clothed arm operating the Rancor on its left side (right for the viewer).
http://www.youtube.com/watch?v=CZy6G_vz_Ng&t=2m28s

When Luke jumps off his speeder bike during the chase, you can clearly see him bouncing on a pad or cushion when he hits the ground.
https://www.youtube.com/watch?v=YCMT1tCY8bE&t=2m52s

During the Space Battle of Endor, the Executor is stationed at the front of the squadron of Star Destroyers during the combat scenes. But from the view inside of Emporer Palpatine’s tower, it’s depicted to be in the middle of the squadron of Star Destroyers.
https://www.youtube.com/watch?v=xPZigWFyK2o&t=2m2s
http://www.youtube.com/watch?v=xPZigWFyK2o&t=3m3s
http://www.youtube.com/watch?v=ZuPe-ly0BHM&t=3m16s