You heard it here first - Soviet Union was a hoax perpetuated by American military–industrial complex in order to get the sweet, sweet budget money and control the population via fear. They orchestrated the biggest role-playing game named WW2 in order to maintain that hoax, up to and including fictional weapons.
Once that hoax ran it's course, they made a new one out of terrorists, <insert 911 conspiracy here>
LOL, actually, I heard it first in that video I mentioned!
As for THX-1138, a quick search will turn up lots of conspiracy kookiness around that, too.
Basically, any kind of recurring easter egg placed in movies or TV shows, especially if it involves numbers, will trigger the conspiracy types.
For that matter alone, were I a movie-maker, I would sprinkle these things everywhere and enjoy the ensuing fun.