One thing I didn't understand when I studied 1984 was doublethink. I just don't get it, it doesn't make sense. How can you hold two contradictory beliefs and yet believe in both simultaneously? It's like saying, I hate apples, and I love apples. P and not P is a contradiction. Also, doesn't doublethink imply that the public (or at least a good percentage) knows about the Party's corrruption? On the one hand, everything the Party tells is lie, on the other hand, it's truth. You have to know that the party is corrupt to be able to 'doublethink', if it's even possible at all. I dunno, I'm just confused here 
its not quite that
doublethink is where you GENUINELY believed that the party is right, and whatever that you hold true is just a spick of imagination that you can push away. Everything change, you cannot even trust yourself (this is shown by the arrest of Parsons, whom still believed the party was right even when locked up in minilove)
doublethink is conscious yet unconcious, but it's basically a tool that you selectively call up information when it suits the situation, and always genuinely believing that its the truth regardless of its distance away from the truth. It removes guilt, it makes the party ABSOLUTE and ABSOLUTELY RIGHT
and doublethink does not require the proles, they are distracted with other things such as the productions from pornosec and the lotto and etc, so long as their public hatred and fervour shown towards the enemy is kept, the party is in control (actually it'll be in control regardless, as production and war keep them in line and satisfied with the poor way of life...
doublethink requires the party members (essentially the outer party, as the inner party knows the truth as truth, i.e. O'Brien) to be totally loyal to the state in front of anything else, even themselves (and by removing the family by putting kids into "scouts" and removing possesion and eliminating love and sex and all that get rid of practically all other types of attachments), which can be said to be fascist, and this clearly shown contradiction shows how George Orwell dispise the fascist militarist government.
it's totally against logic, but it somewhat makes sense, and it works... somewhat