The OOT Emperor
From the 1976 Star Wars Novel:
From Journal of the Whills:
"rotted from within though the danger was not visible from the outside." He explains,“ Aided and abetted by restless, power-hungry individuals within the government, and the massive organs of commerce, the ambitious Senator Palpatine caused himself to be elected President of the Republic. He promised to reunite the disaffected among the people and to restore the remembered glory of the Republic. Once secure in office he declared himself Emperor, shutting himself away from the populace. Soon he was controlled by the very assistants and boot-lickers he had appointed to high office, and the cries of the people for justice did not reach his ears.”
The Original Palpatine became President (not Chancellor like in GL's Prequels).
I think that the boot-lickers that The Emperor had appointed to high office were the Senate that The Emperor disbanded in Star Wars (a.k.a. Ep IV).
From
http://en.wikipedia.org/wiki/Palpatine#Character_creation
When the original Star Wars trilogy was filmed, the Emperor was unnamed and his throne world unidentified. In Lucas's early draft scripts of Star Wars, the Emperor was identified as Cos Dashit. In one version, he rules from the Imperial throne world of Alderaan, while in a draft of Return of the Jedi the throne world is called Had Abbadon.
Though it would not be used in film until the prequel trilogy, the first mention of the name Palpatine was in the prologue of the 1976 A New Hope novelization in describing Palpatine's rise to power. It is unclear, however, if Palpatine was, at the time, intended by Lucas to be the then-reigning Emperor. In any case, the name attached to the sole.
Could the Emperor in the OOT, not be Emperor Palpatine, but a new Emperor named Cos Dashit who came in power and then disbanded the Senate which had controled the past Emperors.
http://starwars.wikia.com/wiki/Cos_Dashit
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Also
I know most OOT fans know this one.
The OOT Owen Lars is Kenobi's brother:
From the Return of the Jedi novel, Obi Wan Kenobi's "From a Certain Point of View" speech states Owen Lars is in fact Kenobi's brother.
http://starwars.wikia.com/wiki/Star_Wars_Episode_VI:_Return_of_the_Jedi_%28novel%29#Differences_from_the_film