He only appears in the scene when he, along with Mr. Hector, Cedric, the Security Guard, and Ms. Stone come into the room to confront Kevin McCallister about his dad's stolen credit card. Kevin hides in the other room and uses a film called Angels with Even Filthier Souls to communicate and scare them off.
Kevin uses the film's star, Johnny, to talk to them by pausing out the other actor's lines, making them believe that Johnny is now staying in the room. He makes it sound like Johnny is accusing Mr. Hector of smooching with Snuffy, Al, Leo, Little Moe, Cheeks, Boney Bob, and Cliff in the hotel room.
Upon hearing his name, Officer Cliff gasps, and Mr. Hector, Cedric, the Security Guard, and Ms. Stone look over at him in surprise and shock. Officer Cliff denies it.