About removing that box below Luke's speeder. I am betting some would say cut to the next scene just before it is revealed. But that seems to mess the music score up.
Just a quick comment on the Imperial Walkers first seen in the distance, it seems a bit like they are even or close to being all lined up even in a row, when clearly later some are in front, while others are behind. That may be something to think about, just my 2 cents.