In an indirect way, if Yoda would not have gotten Luke's X-Wing out of the "puddle" then Luke would not have been able to go to Bespin. From ROTJ, Yoda says, "Unfortunate that you rushed to face him...that incomplete was your training...that not ready for the burden were you." I keep thinking of this possibility and many ideas go through my head.
Would Luke have killed Vader in ROTJ if he did not know that Vader was his father?
Would Leia and Chewbacca still have escaped from Bespin?
Han would never have been carbon frozen!! (testing it for Skywalker) What is up with Vader saying that he was going to freeze Luke and it would be his "journey to the Emperor" ? That is kinda odd to me. They were just going to defrost him and *ding* meet the Emperor, Luke.
Weird. I am not saying that I wish Luke would not have gone. I know his leaving was vital for the story...but I decided to bring this up because so seldom do we think about how the seemingly "small" events play a BIG role in the trilogy.