The chase in AOTC is one of the best bits of the PT and has lots of practical models in it.

The destruction of the Executor in ROTJ is awful beyond words and the shot of the skiff escaping the sailbarge explosion looks like it belongs in an episode of Blakes 7.

My bag with the Yoda scene is Luke is declared sufficiently trained after weeks with Yoda if that and Yoda hangs onto life just long enough for Luke to come back and then weakens and dies in a conversation.

It would have been more dramatic if Luke turned up and found Yoda's corpse and then had a conversation with his ghost about how Yoda can't help him now because he is dead.

The idea of moving the Dagobah scenes to the beginning at least give Luke a chance of taking on Vader.

What get's Luke on the pylon in ESB is 'the Force' of gravity coupled with superhuman reflexes of a Jedi not luck.

The vents are clearly designed to take debris away and dump it.

Luke just grabbed the mast on the way down.