There is something else about that side shot and it has to do with loss of color to the x-wing.

This shot had serious color problems so for the DVD they colored R2-D2 in but they did not properly restore the color to the x-wings red band on the engine and a yellow panel by the window.

There is also something else that I have been curious about and it has to do with the shot where Luke looks out the window of the x-wing.

Now the important thing to note is the sound R2-D2 makes at this time.

after the matte painting of Dagobah R2-D2 is shown in an external shot of the x-wing in the swamp again repeats the same sound or if you like says the same thing.

So I am not entirely sure about this but it could be that the shot of Luke looking out the window was meant to be spliced in to 2 shots rather than as it is in the film as we know it.

so there would be Luke's reaction to the crash and the cockpit shakes (Spliced here) with R2-D2 in an external shot making the sound he makes and says this only once then cutting back to Luke who looks over his shoulder. Then the matte painting.

But it is something that I observed. So it might be a scene re-arrangement at this point directly after the crash. But something feels a little odd about it and I don't think it has anything to do with the replacement Matte painting at all.