I guess the children training with lightsabers scene just struck me as a tad too derivative. I don't mind the concept, the execution was just struck me as a tad too close. Something a bit different would have been nice; blindfolds or maybe being shot at by other students with harmless blasters as opposed to a remote, that kind of thing.
Ooh! I want to go to the school where I get to shoot other students as part of a class assignment!
I was kind of surprised that they didn't have some sort of conversation between Anakin & Owen in
Attack of the Clones just to lend some ring of truth to the bit where Obi-Wan talks about how Owen objected to Anakin's ideals. But then, there were a lot of things that Obi-Wan said that he seems to just be making up for Luke's benefit, like, "Your father wanted you to have this [lightsabre] when you were old enough."
And I think it's worth wondering just how much Owen & Beru know about what happened to Anakin. Owen's line, "That's what I'm afraid of," could go either way. Either he thinks that Anakin got himself killed by getting himself involved in the war or he knows that Anakin turned into an evil, genocidal tyrant.
When
Revenge of the Sith ends, who all knows what really became of Anakin Skywalker? Of course, we know that Obi-Wan, Yoda, & Emperor Palpatine know. But what about Senator Organa? Since R2-D2's memory was never wiped, can we presume that he at least has some idea about what's going on? Exactly what public position, if any, does Darth Vader hold in Emperor Palpatine's administration? It's very unclear.
Of course, I think there's at least a few solid bits of evidence of George Lucas changing his mind and ret-conning certain things from the original trilogy based on changes he made in the special editions.
In the Luke/Biggs/Red Leader scene that was added in
A New Hope, there's an awkward edit where they snipped out a line or two about Red Leader having known Anakin. (They hide the wipe edit by having another X-Wing pilot walk right in front of the camera in the middle of the scene but keep your eye on R2-D2 being lifted into the X-Wing in the background. He suddenly jumps 3 feet higher after the random X-Wing pilot walks past.)
There's also the lines added in the Emperor Palpatine scene in
The Empire Strikes Back. As the scene originally plays, Darth Vader seems to have known since the beginning of the film that Luke was his son. After the 2004 additions, Emperor Palpatine is the one that tells Darth Vader that Luke is his son. Or at least Palpatine confirms it for him. Vader might have already known at that point and was just in denial or was trying to find some other explanation. Of course, considering the nonchalant way in which Palpatine delivers the news, it makes you wonder how long Palpatine has known about Luke, and why is he telling Vader now.