On minute 61m 8sec: when Niky lays down on the floor whit his girlfriend there is not only a mike on the top of the screen, you can actually see the howl stick. If it was not for Colombo how was in the room this wood have killed the romance totally.
When Nicky is undressing to make out with Nellie at her apartment, he sheds his jacket, pulls his necktie off and drapes it over a chair. He sits and unbuttons his shirt. A moment later, his tie is back on. As he and Nellie smooch, the tie disappears and reappears again.