In The Royal Tennebaums, there's a moment where Gene Hackman makes a call phone call in the house, and in the background, for no immediately apparent reason, Pagoda the butler is doing a headstand. Also, the artwork and huge stacks of pornography littering Owen Wilson's apartment.
In Zoolander, the strange little high-heeled trot Will Ferrel does over to the model of the Derek Zoolander Center For Kids Who Can't Read Good. Also, right after Jon Voight delivers the best line of the movie, "You're dead to me, boy. You're more dead to me...than your dead muddah." Vince Vaughn and whoever plays the other brother give Derek these really bitter glares, like they're somehow offended he brought it up.