though the whole Vader arrival/ Imperial Invasion, I really wish the scene where the Falcon escapes would be a little different - it always looked to me as if the hangar was right behind the field where the rebels assembled for retreat, and that would be kind of strange, thinking that Vader and his troops should infiltrate the base from the "backdoor" ...?

I would suggest a more grand overview of the battlefield, maybe the Falcon flying over the destroyed hills, only then rising up into the orbit - so that the assembly point is more far off, about some kilometers from the base