The fast door that Luke shuts as he entered the hanger control room....you can see that it bounces or settles weirdly as though it was made of plywood

I'm pretty sure that was a sloppily executed Jump cut caused in the editing room and not so much a problem with cheap sets, there's also a similar jump cut in Empire when Luke is searching for Vader on Bespin. Adywan fixed them as best he could in his revisited edits

I find I'm a lot more forgiving when it comes to traditional visual effects , than I am with more convincing CGI effects . i still notice them but they don't take me out of the moment like bad CGI does. Although it most likely has to do with the films being better than modern plot-less blockbusters.