This one is a little hard to spot. Having a TV with a very high image sharpness setting may help.

When you get to the scene where the Millennium Falcon is being pulled into the bay of the Death Star, watch near the bottom center of the bay opening. As the ship gets closer to the bay opening, you can slightly see coloration changes, and then the last half second before the scene change, you can vaguely see the outline of a pole holding up the ship. It's there in all three versions (Original, mid 90's redo, and late 90's redo), but is a little easier to see in the first two versions.