Oh jeez, don't even look at the list of goofs involving dialog in the Star Wars movies. Lucas seems to more often take audio from one performance and match it with actions of another, than leave the two together. So there are many occurrences of what you noticed there.

Pioneer PDP-5020FD, Marantz SR6011
Axiom M5HP, VP160HP, QS8
Sony PS4, surround backs
-Chris