Factual error: Listening to a radio broadcast, live, since no other indication is given, Joe Louis is completing the 12th round of a fight. This is December 6, 1941. Joe's last fight of 1941 occurred in September, his next fight was January 1942. (00:00:10)
Factual error: When Captain Yelland is shown the reconnaissance photo taken over Pearl Harbor by his own plane, it is identical to the historic photo from Commander Faraday's files. If you look at the picture, you can see 2 torpedo wakes heading towards the ship in the center of the photo. This is confirmed by the Discovery Channel's "Death of the Arizona" program. The photo was taken just as the attack began, and at this time in the movie, the attack was still a day ahead.
Factual error: Pearl Harbor is said to be 280 miles away from the USS Nimitz. An F8 Crusader on a recon mission to the harbor reports unusual shipping traffic, and that he will make another pass for a close-up series of photos. The CAG then immediately states the F8's ETA (estimated time of arrival) back to Nimitz is 12 minutes. At its maximum speed of 1,225mph, it will need to skip the second pass entirely to have any hope of returning in 12 minutes. (00:23:55 - 00:27:25)
Factual error: The Nimitz's position is not indicated, but most probably it is somewhere south or southwest of Pearl Harbour. Similarly, it is not indicated where the Senator's boat is sailing, but it should be somewhere west or southwest of Pearl Harbour. The two Japanese Zeroes encounter the boat and strafe it, but their flight seems to indicate they would be headed toward Pearl Harbour (or at least some populated island surely) which would indicate they were headed north or northeast. If that were the case, they certainly flew in a large circle around the island chain, which seems unrealistic in terms of fuel, distance, and reconnaissance use. Also they would have had to have flown between the Nimitz and the pleasure craft then headed back toward Pearl Harbour, which makes even less sense in the movie.