This really wouldn't make any sense though. All the Jedi would know "Sido-Dyas" and recognize him when he emerged as Senator Palpatine. It really seems more like Sifo Dias was just a Jedi on the Council who was killed, perhaps under strange circumstances, (though it really couldn't have been someone recognized as a possible Sith who killed him, otherwise just a relatively short time later, when Darth Maul emerged, they would not have been unsure about him being a Sith...I think Windu says something like "the Sith couldn't have possibly returned without our knowing"). Then some time after Sifo Dias was killed, Dooku impersonated him in dealing with the Kaminos. Other saga issues, (all relate to the approx 17-18 between III & IV - based on Luke's presumed age): 1. They did a great job with McGregor playing the younger Obi-Wan. But still, most men around Obi's age at the end of Sith, don't get quite so old looking and so much change in appearance over this time. Would be a bit more believable if like 30 years were between episodes. 2. I know the Death Star is huge, but it still seems a bit of a stretch it would have taken that long to complete it, remember, at the beginning of A New Hope, it is still not quite operational. 3. It seems a little strange that so many years later the Emperor is just dissolving the Senate. 4. Also, Luke mentions going to the Academy. Most likely he doesn't mean with the Empire, so the Rebel Forces have their own acadaemy? OK, but how can they have an Academy on some world, and be safe, and yet their main Rebel Forces are always on the run and in hiding. 5. I know C3PO's memory was erased, so his first discussion with Luke, some of what he said, like not knowing what planet he was on, makes sense. But he knows Leia, (on the ship, he says "there will be no escape for the Princess this time"). But when Luke asks who she is in the recording, he says he's not quite sure, a passenger on their last voyage, someone of importance he thinks. So why does he engage in this bit of deception or manipulation of the truth? Has he been programmed to be guarded against revealing certain details? 6. While Obi-Wan may not have ever technically owned R2-D2, he worked with him quite a lot, especially in ROTS, so he too seems to be holding a bit back by not acknowledging any of this to Luke. Also,Obi-Wan used quite a bit of force pushes and kinesis of objects throughout the PT. So how come now in Ep. 4, he never uses any of this? Did he forget? I doubt it. 7. I still don't really get Vader's dying after killing the Emperor. He got less force lightning than all Luke endured. And his equipment still seemed to be working, you could hear the breathing apparatus, etc. Looks like a quick contrived plot point. Also, if the Emperor was so powerful with the force, couldn't he have broken his own fall?