I wondered about Obi-Wan not recognising R2-D2 in ANH and because, at that time, I had not yet discovered these forums, I asked my Mum. She said it's not a "hole" because of the actual dialogue used by Obi-Wan:
"I don't remember ever OWNING a droid" So maybe he recognised him but remembered not owning him or something...??
captain antilles is the guy strangled by vader at the start of ep IV.....(but then there are supposed to be a lot of antilles in the star wars universe)....there is also a captain bail antilles of alderaan mentioned in ep I (was supposed to be bail organa i think, but i'm bored of the topic, so no more of this).....my guess is this is the same guy all three times, and he's close to bail organa and leia......
c3po definitely has his memory erased, he has no idea what's going on in ep IV, doesn't remember tattooine or obi wan or anything.....but i'm holding out for r2 not to have one, he seems to know what's going on totally, remembers obi wan, knows where to head to get to obi wan's hut etc....i like how these scenes play out, with him knowing and being frustrated at c3po's ignorance.....but i think lucas said they both get wiped, so we'll see....
obi wan remembers artoo ("come here my little friend" etc).....at least that's how i see it....he lies to luke, for the same reason he always does....he doesn't want to open up a can of worms and have to explain things that are best left unexplained for the present....
i wouldn't trust 3po to keep his mouth shut either....