You've got nothing to worry about. From The Digital Bits:

The Final Cut of the film itself has been edited a tiny bit, with a couple of new scenes added and a little bit of footage excised. But the new effects tweaks are very minor. For example, in many shots involving the practical, on-set Spinner, you can see the suspension cables holding it in the air. These have been removed. In a couple instances members of the camera crew were accidentally captured on the edges of the frame, so they've been removed. And there's an instance where Harrison Ford's dialogue doesn't match his lip movements on screen (a shot through the glass as he's talking to the snake dealer), so Harrison Ford's son, Ben Ford, was brought in. He was dressed in the costume and was given the same scar on his chin as his father via make-up. His face was then shot (at the correct angle, under matching lighting) reading the same lines, and his mouth and chin were inserted over his father's so the lip-synch now matches. It's absolutely seamless.