This may be controversial, but I'd like to suggest that a particular line of 3PO's in the carbon chamber be removed. The line in question is "Oh, they've encased him in carbonite. He should be very well protected, if he survived the freezing process that is."

This line has always grated on me, because it's so glaringly obvious! It's what everyone up to that point has been discussing! Boba, Vader and Lando established this very firmly in earlier scenes. This piece of pointless explanatory dialogue, for me at least, ruins the mood of an otherwise wonderful moment that still gives me chills.