I wish that Chewie had been able to recover Han's body, instead of him falling into a chasm, as always. Could have been an immensely powerful scene, seeing Chewbacca grieve for his old friend.
Not really a complaint, just wishful thinking.
Yeah... This.
The cannon explanation from the visual dictionary is that the force was dormant for many years after Lukes jedi academy failed. The force awakened in Rey, providing her with new found knowledge and abilities she previously did not know. That, coupled with her profound hand to hand combat skills with a staff, allowed her to put up a fight against Kylo. Gaspar had a great theory as well that since Kylo was weakened from the shot from Chewbacca, he was using the force to stay alive and therefore was not at full force power when reaching for the Saber.
Ok.... Thanks.