These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Harsher in Hindsight: Watching the episodes 'Lucy Meets Charles Boyer' and 'Lucy and Superman' are particularly saddening, knowing both Boyer and Reeves ended their own lives.
Hollywood Pudgy: Urban Legend has it that Vivian Vance (Ethel) was contractually obligated to remain overweight, though there isn't evidence of it being true, especially since Ethel only looks fat in comparison to Lucy. Get her alone and she's rather thin.
From The Young Fans episode: "Keep jiggling, Peggy."
"Are you tired, run down, listless? Do you poop out at parties? Are you unpopular? The answer to all your problems is in this little bottle!"
Seinfeld Is Unfunny: This show invented the modern sitcom, and every single sitcom that has ever existed since has borrowed something from the lexicon it created, to the point where things that were groundbreaking in the '50s are not even noticable, let alone edgy... unless you are blocked by the Nostalgia Filter. And somewhat ironic for this trope, both the real and sitcom versions of Jerry Seinfeld have proudly noted having NEVER watched an episode of "I Love Lucy" in their lives.