Since we are on the scene of the three SD's colliding, I thought it would a good time to mention these suggestions (if they haven't been mentioned before).
1. While looking out the front windows of the bridge of the Star Destroyer we should (shouldn't we?) see the main hull of the ship (the nose), but we don't. On the Executor as well, we should most definitely see the hull through the windows since it is much longer.
2. In the interior shot of the Star Destroyers Shield collision, near the bottom of the screen one of the computer console set pieces comes away from the wall and is pushed back into place by the extra.