When Al enters Andrew Johnson High, there is a sign that reveals the mascot of Johnson High as the "Impeachers". Andrew Johnson was the 17th president of the United States (served 1865-1869) and at the time this episode aired, was the only president to have been impeached by the U.S. House of Representatives (Bill Clinton later became the second). Impeachment is the first of two steps necessary to remove a U.S. President from office during his term. The second step is conviction in the Senate. After his impeachment, Andrew Johnson missed conviction by one vote and thus was allowed to remain in office.