There was also the matter of the shelling by a Japanese submarine of an oil field near Santa Barbara on the evening before the "Great Los Angeles Air Raid" took place. News about that got out just in time to have lots of people on edge, including the soldiers manning the batteries on the night of the 24th/morning of the 25th. (Both of these events--plus a couple of others--are altered substantially and played for comedy in the 1979 Steven Spielberg film 1941.)I was watching the History Channel the other day and came across a show that was talking about a UFO sighting in Los Angeles in 1942. It was called "The Battle of Los Angeles". I have never heard about this before now, (the Los Angeles sighting) and think it's really interesting. Supposedly they tried to shoot the craft down, they weren't sure if it was a real UFO or something from the Japanese. Here's soom footage about it:
http://www.youtube.com/watch?v=EhjkMoWLE_Y
Not to sound like a cliché, but the prevailing theory is that they were in fact weather balloons (many of which had been released in the Los Angeles area) that prompted the initial barrage which was later compounded by smoke, flares, exploding flak, and reflections of spotlights off of the clouds which confused observers even more.
Given the justified fear of a Japanese attack on the West Coast from submarine launched aircraft, and coming so soon after the attack on Pearl Harbor...
UFOs? They're unidentified, but often end up being attributable to less-than-otherworldly causes.