Kubrick: Speaking Through His Characters

So far, I have found two quotes in Kubrick's films that give the viewer an hint what they should do, if they want to decode some of his hidden messages:

HAL

Well it's rather difficult to define. Perhaps I'm just projecting my own concerns about it. I know I've never completely freed myself of the suspicion that there are some extremely odd things about this mission. I'm sure you'll agree there's some truth in what I say.

…

HAL

… I never gave these stories much credence. But particularly in view of some of the other things that have happened I find them difficult to put out of my mind. …

Put the individual "oddities" together. Are they random? Or does an picture emerge?

ULLMAN

… Oh, about the things you saw at the hotel. He told me they've really gone over the place with a fine tooth comb and they didn't find the slightest evidence of anything at all out of the ordinary. …

Take a fine tooth comb, and look for anything out of the ordinary, and you (unlike the police in the deleted ending of The Shining) will surely find something.

I'm sure there are hints in his other films, alas, I am now stuck at 2001 …