The first time Lucas rather than extrapolating or adding things to the Canon from what we knew, Very clearly set out to contradict established canon was in Episode 1.
He obviously did not rewatch the older movies, or care to even make things consistent because after all these are kids movies right?
But since he had a bare outline that basically said Luke's father and Obi Wan did stuff to set up the oot. In which the oot vader goes from being the murderor of luke's father to being his father.
Other than that change and the Leia being the sister change the other prequel outline stuff should have remained the same. Yoda was Obi Wan's teacher etc. No Jar Jar binks or Qui Gon Jinn.
Anakin was a good friend. And an excellent starpilot. Not shown in the prequels. Unless you consider that race car thing he drove as a kid or accidental blowing up a trade federation command ship.
He was not a good friend in the prequels. He was a whiny, bitchy insurbordinate brat, emo teenage jedi wannabe. Killer of women and children sandpersons and younglings and wife strangler to save his wife he had to kill her,lol. He comes off as a complete asswhole.
The jedi order and the galactic senate responsible for democracy come off as buffoons or worse they are retards on purpose to serve the plot.
The Jedi are such prudes on marriage and sex that you almost cheer anakin on when he cheats on the orders beloved and sacred code. But then Falling in love makes you kill children and become a mass murderor who on the turn of a dime kills his brethren and friends he spent years with on a whim based on a frickin bad dream.
The prequels are six hours of over the top granduer of cgi and action. Just don't watch them looking for even in universe fictional star wars logic, or logic of any kind or a story. Because then you will clearly be dissapointed. And pointing out that the prequels are basically six hours of a cartoon or video game footage would not to fair to cartoons or video games.
The only substance to these movies the space battles, and lightsaber duels. I mean it is as if Lucas did not even bother trying to tell a story. Or maybe the story he told i did not pay attention to because it was unlikeable and unbelievable.