Smirk - basically most (if not the entire movie is a dream within Tom Cruise) - You'll notice, that throughout the film he visits every scene twice - for some reason. And the Xmas trees in virtuallye very scene? I dunno.
You'll enjoy this. Once upon a time, I lived next to this real asshole that was extremely discourteous (loud music, loud talking - between very thin walls). So, to piss HIM off (and accelate the acrimony) I pushed my speakers flush against the wall toward his place, turned the volume up to 11, selected 'infinte repeat' for one track, and left for the weekend.
The track? The creepy music from the 'orgy scene' from Eyes Wide Shut.