In the pilot episode, set in San Francisco, the Mayor Jack Flambo is played by John Vernon, who also played The Mayor (of San Francisco) in Dirty Harry (1971).
This very first episode includes what would go on to become Captain Trunk's trademark line: "HAMMER! In my office RIGHT NOW!"
This was the Pilot, shot several months before the show was picked up, which is why many of the credits differ from the running episodes.
During filming of the scene in which Hammer uses a bazooka, onlookers actually thought they were watching the filming of another "Dirty Harry" sequel.
This episode originally included a scene in which Hammer interrogates Kruggle by burning him with hot coffee and firing a rifle at him. But ABC felt that the Kruggle was likable and audiences would not like to see him tortured so the scene was deleted. It was restored for the DVD release.