Lets see...
1) The sounds the Tie Fighters made when passing...it's space, near perfect vacuum...there is no means of propagating sound in space. (See also Jango Fett's Seismic Charges in Episode 2)
2) Boba Fett, the baddest bounty hunter in all of known space got punked...he deserved a better death, hell even a decapitation, ala father, would have been preferable.
3) Death Star is HOW big? And they only have ONE tractor beam? Yeah I know they wanted them to escape to track them but it was a little too obvious.
which brings me to number #4...
4) No guerrilla organization would have ever allowed Leia anywhere near their super secret hidden rebel base after having just escaped from the Death Star. That screamed trap. There would have been protocols for exchanging ships at least once in their.
5) I know it's 20 years later but all vestiges of Clone War tech is wiped from the universe? Hell I still see original VW bugs on the road. He diverged too much with the ship designs in some aspects and stayed two close with others.
6) The Jedi went WAY too easy. Even with Order 66 there should have been A LOT more warning. I don't care how much cloudiness the emperor could put out.
7) Lets not forget the battle scene on the lava at the end of Episode III. Dramatic looking HELLS YES, but those boys should have been toasted in three seconds flat. And don't get me started on the don't try it Anakin I have the high ground thing...jump to the shore and then start battling.

Mitichlorians or however you spell the damn things, Lucas' need to divest the Force from any religious / spiritual aspect it once had.
9) Suck up and deal already George and re-release the Star Wars Holiday special. You put it out there in there, not us. I'm tired of having to watch my fuzzy originally taped off of air VCR version.
That being said the original trilogy is still one of my favorites and I love the universe that has grown up around them.