-Neimodian voices were severly botched - no consistency with the other two prequels.
-Palpatine's "Yeah!" at the beginning when Obi-Wan takes out the Super Battle Droids. Not in character for him.
-The "Padme dying of a broken heart" thing needs to go. Make her die because of Anakin's Force choke.
-Instead of rehashing old Han Solo lines, (see: "This is where the fun begins") why didn't Anakin do some of Vader's one-liners like "All too easy" or "There will be no one to stop us this time" or even something as simple as "As you wish." There was none of this.
-And what's with the Obi-Wan "flying's for droids" line? He seems to hate flying, yet he's always flying. I don't get why Lucas keeps emphasizing this.
-I thought Alec Guiness said he hadn't gone by the name of Obi-Wan since before Luke was born. Leia also mentions he served Bail Organa in the Clone Wars. Oh yeah? When?
-Reinsert Mon Mothma/birth of Alliance scenes and the Dagobah landing. Qui-Gon should definitely be in there. And if additional scenes exist, some more of Kashyyk would be nice.
-Speaking of Wookiees, cut out the stupid Tarzan yell.
-I didn't like Palp's line about "My apprentice will be more powerful than either of us, Yoda." Because, truthfully, he won't.
-Samuel L. Jackson gives the most stale line readings of all time in this one - rivaling even the Phantom Menace for worst acting. His performance needs major work.
-And some work definitely needs to be done on the Vader scene. Waaay too Frankenstein, to the point of laughter. Cut out the stumbling forward, and maybe the "Noooo!" could be replaced with the Vader yell from the ESB duel when Luke hits Vader's shoulder. That sounded pretty angry. Also, Palps needs to blame OBI-WAN for Padme's death, or the Jedi, not Anakin! I have no idea what the hell Lucass was thinking!
-The music in this movie was completely hacked up by the editors, it could use some smoothing out. And where was "Luke and Leia's Theme" from ROTJ during the birth scene? I think it would've made more sense to use that than Luke and Leia's seperate themes. Use their seperate themes when they are split up. And where was the Emperor's theme (hello?) and I would've really liked to hear that male choral bit from the Father vs. Son duel in ROTJ at some point in the film, during Mace's death even.
-One last thing. I really missed Anakin's murder of Shaak Ti in the Jedi Temple. That certainly needs to be reinserted.
That's all I can think of for now. PLEASE someone start working on this!
And then let me know where to get it.