I remember noticing one instance in the prequels where they reversed a shot of Anakin for about a second or two so they could extend the scene. It’s during the part in AOTC where he’s describing his Tusken Raider killing spree to Padme. There’s probably countless examples of editing artifacts like these being left in scenes due to the editing together of separate takes into the same shot.
Honestly I think Lucas went a bit overboard with his merging of takes. It kinda takes something away from the actors’ performances in my opinion. I guess he was just really eager to take full advantage of the new tech, that’s just my thoughts though.