To finish off with a couple of other things with this sequence that I'd like to see done, if possible -

When Vader 'breaks' off the FIRST large section behind Luke to 'throw' at him....just at the point that Luke strikes it with his Lightsaber, you can make out (if you 'freeze-frame' it anyway - it's also visible in shot 4 of Monroville's 'thumbnail' shots in a recent post, and he has put a rectangle around it) that on the left of the shot, above Vader's helmet, that we see the 'gate' is no longer shut in front of the 'access tunnel' that Luke exited from. In fact, at this point you can see a little bit of the 'gate' at the top. Yet later on again, at the point where we are looking at Vader 'breaking off' his SECOND large section to aim at Luke, that the 'gate' looks like it is shut again now! No biggie though.

What has always been a biggie to me though, is the fact that in the 2 shots preceeding Luke crashing through the window, that the actual window frame 'pattern' is a lot more complete than it is in the shot where Luke hits it. I know there is a very brief shot in-between, showing the back of Luke as Vader clings onto the 'pillar' opposite the window, and that some of the 'debris' may have smashed more of it during this time....but it seems too short for this to have happened to satisfy me.

I'd love to see the frame 'pattern' added in to be the same as the 2 preceding shots, up until Luke actually makes contact with it, as he falls out! I reckon this would tie-in far more plausibly because of the briefness of the intervening shot between them.