Strange scene in Zero's apt.
Zero is supposedly obssessed with privacy, but Stiller doesn't even knock before entering his bedroom (where he could be wanking, for all Stiller knows).
This is either a plot flaw, or underscores an enormous level of trust/comfort between Zero & Stiller.
Either way, I don't know many men who would want any other man to be able to enter their home unannounced, and then enter their bedroom without knocking.
(I know there's cameras in place, but Zero didn't seem to be watching the screens.)