Very cool site!
Notice the page that is titled "Miscellaneous Aircraft", and on the bottom of it there is a picture showing a B-25 hulk with a single vertical fin tail fitted, and the question is posted as to why it was done. The reason for this was that at the time of the attack on Pearl Harbor, there were no B-25's on the island. There were however several A-20's on the island at the time of the attack, and in the scene where only the tail of the B-25 can be seen, from a ways off, it was meant to appear as one of these A-20's. From the vantage point that is shown of it in the movie, it pulls it off very well.
I've always enjoyed the fact that despite what was available to work with when the movie was made, those in charge tried very, very hard to do it right. The vast majority of the original Zero/Kate/Val replicas are still flying today with their original modifications in-place, and I think it has to be said, that the reason for this is that the work that was done in order to configure the BT-13/15's and AT-6's as such, was done as well as it was.