So, lemme think. I never liked the back cover being done in that "Impact" type font, the fonts used need to be pretty classy and, well, classic. Have an old-fashioned, timeless feel about them. Nothing too insane or dramatic or cheesy.
Right below or next to The Empire Strikes Back, let's put in Classic Edition, slanted to match the Empire logo, if that looks all right, or just put Classic Edition ...
On the back cover, well, it's not written and directed by George Lucas. =) I don't think there will be any special features to note. Sound mix from the original 35mm theatrical presentation. Just put basic notes on the presentation and preservation of the film as seen in 1980, but mainly a description of the plot, the official descrip should do.
The starfield is dodgy in your mockup, it looks cloned and pasted, put a proper one in there, and we're good ...
Thanks for doing a cover already - exciting!