none said:

Harmy wrote: They're not getting rid of the frames, they're fixing them.

Right, three of the four images You_Too posted suffer a lower edge which is blown out as most likely the next frame has a very bright explosion. The light bleeds between frames causing the neighboring frame to change color along the bottom or top edge.

Not sure what's caused the error in the R5/Luke/3po shot. It's close in size and shape to a Reel Cue Marker, but it's not punched out, just a modified ring. weird.

I wouldn't call these errors, it's glue and tape visible from the splices, and I'm pretty sure the blue in the bottom corner of the shot of R2 and the Jawas are part of the animation/special effects work, there are similar cases of shortcomings and side effects of the animation work seen where it shouldn't be in other parts of the films.