Lkeller said:
You're assuming that one season of shows equals a year in Will and Carlton's lives. Remember that MASH ran for 11 seasons on CBS, yet the US involvement in the Korean War lasted only 4 years, and a regular tour of duty for an army draftee was only 2 years. I think we can assume that each season (26 shows) represented only a few weeks in the lives of the characters.
"M*A*S*H" was replete with continuity bloopers -- Potter was originally from Nebraska, then Missouri -- his horse started out male, then became female, etc. One late-season episode telescopes the events of a full year, from one New Year's to the next in a single episode, yet chronologically it starts when Henry Blake should have still been commanding and in the episode Potter is there the whole time, etc., etc., etc. And, of course, you have the phenomenon of Harry Morgan appearing as a one-shot character, then later returning as a regular, different character -- that happens a lot in TV shows. (On "All in the Family," both Allan Melvin and Vincent Gardenia appeared as minor one-shot characters before becoming regulars.) But that sort of thing happens all the time -- "Barney Miller" was famous for actors showing up 3 or even 4 times as different perps, same thing happens on "Law and Order" where the same actor might be a lawyer in one episode, a suspect in another, etc.
But, really, there are few shows totally free of these sorts of things. I think we have to keep reminding ourselves that this is fiction, and there is a certain suspension of disbelief that must take place to enjoy it. Hell, "Star Trek" and its many sequels have even spawned entire books nitpicking all sorts of goofs including glaring continuity errors -- they are debated endlessly by Trekkers, but they still watch the shows and enjoy them.
This is why I like some of the Cartoon Network shows where they just deliberately throw continuity out the window (kind of thumbing their noses at the nitpickers), like "Sealab 2021" where the facility was destroyed at the end of several episodes, only to be back intact at the beginning of the next, with no explanation. ("Billy and Mandy" does that a lot, too -- how many times was Billy's house wrecked over the course of the series?) And, of course, the king being "South Park" with Kenny being killed again and again. Sometimes, these shows will even refer to these things very tongue-in-cheek ("Wait....but didn't such-and-such happen in a previous episode?"). In live-action, too -- recall Will Smith's very funny reaction when his Aunt was recast, or when one of Roseanne's daughters suddenly reappeared on the show after several years.