7. The whole bit with Yoda and the burning of the Jedi writings. Gah. First we never got to explore what was in those writings, but we are told by Yoda that they are ancient and sort of obsolete. So really no big deal if Luke burns them. All that was missing was Yoda saying the ancient Jedi who wrote those texts were old white men, so what good could they possibly teach Rey anyway. Besides, they were probably slave owners too.
I find it quite ironic that a movie that they would pump "out with the old, in with the new" in a movie that tries to draw so much from the originals. The ending battle obviously tried to borrow from the battle of Hoth.
Yoda:
L: Master Yoda.
Y: Young Skywalker.
L: I'm ending all of this. The tree, the text, the Jedi. I'm gonna burn it down.
Y: Ah, Skywalker. Missed you, have I.
L: So it is time for the Jedi Order to end.
Y: Time it is. For you to look past a pile of old books, hmm?
L: The sacred Jedi texts.
Y: Oh. Read them, have you? Page-turners they were not. Yes, yes, yes. Wisdom they held, but that library contained nothing that the girl Rey does not already possess. Skywalker, still looking to the horizon. Never here, now, hmm? The need in front of your nose.
L: I was weak. Unwise.
Y: Lost Ben Solo, you did. Lose Rey, we must not.
L: I can't be what she needs me to be.
Y: Heeded my words not, did you? Pass on what you have learned. Strength, mastery. But weakness, folly, failure also. Yes, failure most of all. The greatest teacher, failure is. Luke, we are what they grow beyond. That is the true burden of all masters.
By this point Rey already has the books. At the end of the film you can see them with her. So between reading the books and Force Spirit Luke, she will learn to be a true Jedi. And then she will probably refound the order.