Aside from Padme mysteriously knowing about the hangar, I really can't think of any plot holes. And I don't think all the Stormtroopers are clones. If their age was accellerated they would be too old by the time of the OT. And Obi-wan does know Luke before ANH. Remember he addresses Luke by name after Luke gets up in the Wastes of Junland.
Aside from Padme mysteriously knowing about the hangar, I really can't think of any plot holes. And I don't think all the Stormtroopers are clones. If their age was accellerated they would be too old by the time of the OT. And Obi-wan does know Luke before ANH. Remember he addresses Luke by name after Luke gets up in the Wastes of Junland.