The first change is the bad one, between the shot of Ben and Luke lifting the damaged Threepio and the borked image of Ben's hut.
The second is between the scenes "we've captured a freighter..." and the Death Star docking bay.
The third is between the shot of the Millenium Falcon escaping and "Are they away?"
BTW Citizen, how are you doing with the audio sync issue? Are you finding you have to trim small sections of the audio from the DC discs in order to maintain lip-sync?