1. Anakin Skywalker really was the Chosen one
While Yoda and Mace were right about Anakin eventually turning to the dark side, they didn't know he would fulfill the chosen one "prophecy". He ends up killing the emperor, bringing balance to the force.
2. It's not a trap?
The famous "It's a trap!" line in ROTJ by Admiral Ackbar, was actually going to be "It's a trick"! I'm glad they changed it though.
3. No Luke, I am your father
After revealing that Vader was Luke's father, a child psychologist told George Lucas that children wouldn't believe it to be true. That is why there was a scene of Yoda confirming it to be true in Return of the Jedi
4. Iconic Character Names not spoken in Star Wars
Boba Fett, Palpatine, and Ewoks are all not spoken in the original films!
5. "I have a bad feeling about this"
The "I have a bad feeling about this" is said in every Star Wars movie except for The Last Jedi. RIP traditions.
Thanks for reading!