Cleopatra said:

So I know that this has probably been mentioned before, but why is Ady taking away the red AT-AT windows? I feel like they were meant to be red since they were depicted as such in the movie posters and paintings.

And, unlike the blue escape-pod door which was actually supposed to be blue in ANH, the red windows aren't very annoying. They're actually kinda creepy.

It's because the red window only appears in one shot in the whole battle and only on the lead AT-AT. If the windows were meant to be red then why aren't they throughout the rest of the battle?