At the very, very end, after the credits are done rolling and Gadgetmobile finally quiets up, you see the typical logo for Caravan Pictures of a man's silohette as he walks down a lone road. But this time, a copter pops out of his hat and he flys away.
While the credits are running, there is a scene with Penny creating the communication system with Brain, who speaks in the voice of Don Adams doing Inspector Gadget (cartoon). Later on, when the credits list the voice of Brain, they add the parenthetic "(really!)" after Don Adams.