yoda-sama said:

Error or not, you'll notice they specifically gave that accident a pronounced bonking sound effect. In short, they embraced the messed up take. Why they'd embrace a simple timing muck up on the opening of the movie, though, I have no idea.

Not sure why you'd think ESB and ROTJ would have musical cue issues, it only occurred in original Star Wars because they later added in the episode number and title, the sequels always had episode numbers and titles... and they didn't flyover Tatooine...

I dunno why but i thought ESB started with a reveal of Hoth in the same way as Tatooine, anyway...