There has been only one (canon) instance of Skinner's real name spoken of after this episode. In the aforementioned episode "I, Doh-Bot", Lisa renames her 5th cat Snowball II to save money on stuff and Skinner walks by and said "Isn't that a cheat?" Lisa then calls him by Armin and Skinner walks off.
"Armin Tamzarian" is an Armenian name, which is also the name of the Real Estate agent of the writer of the show, who later went on to become a lawyer for Fox.
In the DVD commentaries for this episode, writer Ken Keeler among others defended this episode against the strong negative reaction from fans and critics due to its heavy continuity snarl over Principal Skinner's life. Matt Groening and Harry Shearer have gone on record to say that this was their least favorite episode.
Besides respecting the history of the Skinner family, the concept is hated by the majority of the audience. The changing of fan favorite Principal Skinner to Sgt Skinner makes this one of the most unpopular Simpsons episodes, thus making Sgt Skinner one of the most unpopular Simpsons characters, making it one of the few Simpsons episodes to be explicitly dismissed from canon.