Note: Following the events of Charlie Sheen's departure from Two and a Half Men, CBS ordered an additional two episodes for Rules of Engagement’s fifth season, bringing the total number of episodes to 26 from the initial 24 ordered.
Observation: Following the events of Charlie Sheen's departure from Two and a Half Men, CBS ordered extra episodes for Rules of Engagement’s fifth season, increasing the total number of episodes to 26 from the initial 24 planned.