Whistling 'Dixie'
Only me, or did it remind any1 else of Omar from The Wire whistling 'Farmer in the Dell', everytime Richie was literally whistling 'Dixie'? In both, anytime u hear it, u know something bad is going down.
Also, I think this may be a clever play on words, from the expression "I ain't just whistling 'Dixie'" - meaning, whatever is going on is real, I'm really doing it. What we see on screen is really happening, and not just in John's mind, as some of the Fight Club theorists are suggesting.