Harsher in Hindsight: The ending of the "La función debe continuar" four-parter, whose aesop is that the end of the physical existence of a work does not truly mean it's gone, is a lot sadder after Chespirito's death.
Nightmare Fuel: The episode with the giant, at the end when it steps in Chapulin, complete with Chapulin screaming and a sound of bones cracking. Chapulin was fine though, it was a dream.
Recycled Script: Chespirito tends to wallow in this trope. Practically all the later episodes are recycled versions of earlier ones. In some cases, this was because the earliest episodes of the series were a little primitive and he decided to do a more professional re-shoot. However, by the end of the series proper, many episodes were on their third or fourth retread. And that doesn't even count the subsequent sketch-show years.
Special Effects Failure: Plenty of times, especially when using the Chicharra Paralizadora and the Chiquitolina pills.
Tear Jerker: The ending of the "La función debe continuar" four-parter. After the old man finishes touring El Chapulín through the filming studio, he is convinced that the studios will remain even after being demolished because no one can destroy what was done there. El Chapulín is touched by those words, even doing a Title Drop to point it out. It's basically the way Chespirito thanked all those films that left a mark in history. It goes even further through Harsher in Hindsight, as explained above.
They Changed It, Now It Sucks: Although the show was fairly the same for about twenty years, some will argue that the departure of actors Ramon Valdes and Carlos Villagran roughly halfway through the show's run seriously hurt its quality. Others disliked the removal of the laugh track at about the same period of time.
Values Dissonance: Rarer than in El Chavo del ocho but you can easily tell that it is set in the 1970s when in an episode a man working in the house while his wife got a job is played for laughs and the plot is "resolved" once he overcomes his doctor anxiety and establishes himself as the boss in the house making the wife go back to housewife and everyone acts as if balance had been restored. This episode was re-made in 1991 without one detail changed.