The good and dark side of Star Wars (Keep in mind, these are my opinions and not necessarily agreed by all SW fans):
Good revelations: Darth Vader is Luke's father
Bad revelations: Leia is Luke's sister
Good revelations: The force is explained as "mystical" and all powerful energy field
Bad revelations: The farce is explained as "scientific", Midichlorians are symbionts to all living beings
Good revelations: Anakin was a powerful jedi, influenced by the Emperor and seduced by the Dark Side to become DV.
Bad revelations: Anakin is a virgin birthed chosen one, born from Midichlorians who will bring Balance to the Farce.
Good revelations: Love triangle between Leia, Luke and Han (circa 1977 - 1980)
Bad revelations: Luke and Leia are twins (1983)
Good revelations: Han shot Greedo first - Mercenary, smuggler, scoundrel Han
Bad revelations: Greedo shot Han first - Soppy Han
Good revelations: GL wanted to create a 9 story saga (1980 - Time magazine)
Bad revelations: GL stated ROTJ was the last (1983); GL later decides to do PT, stating SW is a 6 story saga.
Good revelations: SW is about "The Adventures of Luke Skywalker"
Bad revelations: SW is about Anakin Skywalker (1999)
Good revelations: ROTJ originally was planned for Wookiees
Bad revelations: Ewoks
Good revelations: Anakin is redeemed (Sebastian Shaw)
Bad revelations: Anakin is redeemed (Hayden Christiansen)
Good revelations: Yoda's knowledge and experience with the force knows no equal
Bad revelations: Yoda fights Dooku with a lightsaber (IMO, Yoda should not have given in to Dooku's taunts and prove anything to Dooku)
Good revelations: GL made the decision to create the PT
Bad revelations: GL made the PT as is.
Kevin