"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."
^^
Good catch oh_riginal.................sounds like something that can be fixed fairly easy.