After Samantha offers Nick Valium for his withdrawal symptoms, the yellow kayak (which we saw Nick drag to the far side of the yard in an earlier scene) appears behind her in the vicinity of the improvised living room. The kayak has been moved there to be revealed as the location where Samantha has hidden his beer. In the morning when he awakens from his stupor the kayak is back in place near Elliot and Kitty's yard, where Nick originally dragged it.
Camera and camera operator sitting motionless are reflected for an extended length of time in the glass shower door in Nick's master bathroom (lower left of frame). Scene occurs toward the end of the film, after Nick is provided keys to new locks and regains access to his home.