It's been tough to find things that bother me about ESB, knowing the majority of them are being fixed. I've made many suggestions in this thread (some rejected, some supported), and after all this time, my idea well is running more and more dry!
But... here is one thing I've been meaning to mention for a while, and just kept forgetting to do for some reason... toward the end of the asteroid chase, just before Han finds the asteroid cave, he says "there, that looks pretty good." While he says this line, he points out the cockpit with his finger, implying he VISUALLY spotted it with nothing but the eyes he was born with...
... yet in the next shot, while Leia is asking "what looks pretty good?", the view outside of the cockpit is very clearly NOT showing a cave yet! As they continue flying, only then does the cave appear. How could Han have known there was a cave there? For all he knew, it could have just been another valley!
A fix could be just replacing the footage outside the front of the cockpit to show what Han is talking about, maybe making the cave appear a lot sooner, or making the valley bigger so that they are already flying into it when Leia says the line. Otherwise, it is just illogical to see how Han spotted a cave that he couldn't possibly have seen yet, as he kept the Falcon flying low the entire time.
"What looks pretty good?" Indeed.