I can only speak for the things I’ve found, but this one’s definitely a Deliberate Creative Decision:
What’s happening here is that there is a noticeable increase in brightness between the first and final frames of this shot, as if someone thought ‘hey, the door is opening but it’s not getting bright enough inside’. The SSE shows no increased brightness.Anything else?
That’s all I know for sure that was intentionally changed. The removal of the single frame laser blast from the TIE cockpit might have been intentional, but I doubt it.