If you're still doing Disney What if, I have some ideas:
What if Buzz missed the ball, when jumping off Andy's bed, trying to prove he could fly?
What if Aladdin told Jasmine the truth when she demanded it?
What if Jafar didn't try to kill Aladdin, after getting the lamp from him?
What if Eugene figured out who Rapunzel was, when they met? (he knows the ceremony is for the lost princess and she tells him that the lanterns come out on her birthday, so...)
Hello there. Are you open to suggestions?