I think I have found a "BIG" plot flaw

Rating: Null/10 (5 June 2002)

In short..... At just about the end of A.O.T.C we find ourselfs at the farm in the beginning of the Star Wars movies episode 5. Here we meet the the people that end up taking care of Luke (his uncle)......Q:Why then does C3PO not know any of these people nor the place, nor the planet when he is sold to them in epsode 5.Also why then do they not know him nor R2D2. If some one could inlighten me I would be greatful.... THX....Matthew