636th Episode Celebration couch gag

The 636th Episode Celebration couch gag is the ninth couch gag of Season 29.

Plot
The Simpson family runs into the Museum of Television, running past exhibits of long-running TV shows until finally reaching their couch, celebrating a record-breaking 636 episodes (surpassing Gunsmoke). The Simpsons sit on the couch as usual, except for Lisa, who skeptically looks up her MyPod and discovers that it's only episode 632, much to Homer's disappointment.

Character Appearances

 * Homer Simpson
 * Marge Simpson
 * Bart Simpson
 * Lisa Simpson
 * Maggie Simpson

Behind the Laughter
This couch gag is similar in premise to the 500th Episode Celebration couch gag in that the show celebrates an episode milestone too early, and Lisa notifies everyone else of their mistake.