Captain Antilles said:

...First of all, I noticed that when R2 is leaning back to observe the X-Wing being guided back onto land from the swamp, there is a light just below his dome that I’m not sure should be there. As he leans back, it seems to "blink" and disappear and then reappear again. I can’t tell if it’s just a sliver of light leaking from inside the “costume” or if it’s a reflection from the camera or something. Either way, I don’t think it belongs. What do you all think?

I could be mistaken, but I believe that yellow blinking like you see coming from below R2's dome is the light on the back of his dome that blinks yellow and green. And since his dome can rotate 360 degrees, it is possible for it to peak out a little bit from within the very little gap between his dome and his hull.