"Tora, Tora, Tora!" is indeed one of the movies where even a history fanatic like me finds nothing to complain about. There are arguments going on about the question whether or not Japanese Admiral Yamamoto ever said this famous "sleeping giant" quote which is presented at the end of the movie, but even if he didn't I suppose it would be a tolerable mistake. The movie is really accurate about many details and unlike many other movies it doesn't come accross as propaganda.
They also made better use of original footage (mainly the explosion of the USS Arizona) than they did in some other movies.
The movie Midway, for example, is somewhat careless about the original footage. It is not really a bad movie, but more of a story compared to the historical account "Tora, Tora, Tora!" gave. While the original footage of the movie Midway is interesting to watch it includes many plains which weren't even prototyped by the time the battle was fought (e.g. Grumman F6F Hellcat, F4U Corsair, and Curtiss SB2C Helldiver) while on the other hand it seems that there wasn't any original footage of some planes which fought in the battle (Grumman F4F Wildcat, Douglas TBD1 Devastator).