Brian Edward O'Connor improvised much of his dialogue as Schemer. He also came up with the idea of his single hair curl, as well as his garish costuming (which he staid belonged to his father). In fact, O'Connor improvised so much during filming that he was eventually given credit for Additional Material.
A fourth season was considered but George Carlin knew his schedule wouldn't allow him to continue full time as Mr. Conductor, the main character. So several made-for-TV movies were made to follow the third season (see Movie Connections).