Peter, make sure you remove those strange lozenge shapes on the upper an lower wings. I think they might be some kind of lifting lugs for the museum example measured and were not present on a flying Spitfire. That is the only really visible mistake that Revell have made.
There are a few minor quibbles. As you are adding detail to the cockpit I'm guessing that you will pose the door open. If your model is at a date prior to January 1942 you need to remove the crow bar from the door.