What if Qui-Gon had left Anakin on Tatooine, or had been caught cheating with the dice?
What if Mace Windu had helped Anakin liberate the slaves and his mother?
What if the Trade Federation had turned down Darth Sidious?
What if Jengo Fett had stuck to Bounty Hunting instead of taking up cell donation for cloners?
What if Dooku stayed with the Jedi order?
What if Anakin had saved his mother from the Tusken Raiders?
What if the Jedi got the plans to the Death Star?
What if Jar-Jar was a really great character that everyone loved?