Actually, 9:18 would make it 18th September. It more than likely is one of their wives birthday's, but it definately means something else. Everything does 🙂 They are sneaky gets and back then (99) when the interview which mentions it takes place, they would probably have said something like that to put us off the trail 🙂
Well again, what makes these movies an exceptional creation and a masterpiece is that there's a lot to think and nothing is simple, who ever say this is a simple movie don't understand anything.
I don't see one of the W. bro, saying "Yes, a lot of things in the movie are subliminal and lots of them make reference to the bible".
I believe that there are more codes in this movie than what we can see, and I believe that at the end, the idea is to really free peoples minds, to give the chance to believe that we can be wrong in our believes, that everything is possible.