A bit of Black Comedy at the beginning of the attack: The Japanese planes begin their attack run while the American sailors are standing at attention and raising the flag, while a band plays the Star Spangled Banner. The American personnel continue to stand at attention and salute even as the first explosions go off, and the conductor, rather than cut off the music, has the band play faster so they can wrap it up and take cover.
Truth in Television. It's considered a part of military band code back then that when you started the Star-Spangled Banner, you had to finish it unless you are physically incapable. The players weren't physically incapable, but if they stood out there any longer, they would have been. This was fixed in a later draft.
One Japanese cook tries to explain the concept of time zones and the International Date Line to a co-worker, who just isn't getting it. Just as it seems he has finally successfully explained it to him...
The line is even funnier upon further consideration, as when taken out of context, it actually sounds kind of deep.
The Japanese pilots are using flashcards to practice identifying their targets. They successfully guess the Pennsylvania and Oklahoma. One pilots hastily identifies the next card as the Enterprise, and is informed that it is actuallyhis own flagship.