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.
Complete Monster: Vicious. The reasonable response to your best friend seeing your girlfriend is not to sadistically force her to decide between her own death and having to kill her lover herself. Vicious has loyalty to nobody and thinks nothing of betraying former comrades to death or prison... he doesn't even register when men loyal to him give their lives as they're expendable to him. He also has no qualms about betraying anyone, whether he's usurping power from his leaders or cutting the throat of the foster father who saved his life.
In The Movie when all the classic war planes are taking off one of the planes is piloted by the three old guys. As they're taking off one of them asks the others where they're going and gets the (incorrect) response that they're "going to sink the Bismarck". The plane they are flying in is the same model of plane that delivered the crippling torpedo shot to the Bismarck. In a further bonus the name of that model of plane is Swordfish.
All the written Chinese (no, it's not Japanese, despite the origin of the show) and other languages.
The chess game between Ed and the Chessmaster.
Germans Love David Hasselhoff: While it's still respected in Japan, this series is one of the most beloved anime in Europe and (especially) America. This is partially because it uses so many American action-movie and Western tropes that at times it seems like it was made for a Western audience.
The episode "Wild Horses" has an old old Space Shuttle being brought out for one last mission. The shuttle? Columbia. Cartoon Network actually pulled this one off the air for a while after the Columbia was destroyed during re-entry. Even worse, the episode mentions the shuttle's heat-resistant tiles being damaged, which is what caused the real Columbia to be destroyed.
Cartoon Network also pulled "Cowboy Funk" from it's first run in September 2001 for it's depiction of a pair of identical skyscrapers being destroyed by a terrorist.
As was "Waltz for Venus" for the opening scene of terrorists taking over a commercial airliner.
In "Jamming With Edward", Jet making fun of Faye's age provides some really depressing Foreshadowing.
The Movie didn't get an American release in theaters until two years later due to its terrorism theme and that the movie made its run in Japanese theaters just days before 9/11.
Hell Is That Noise: "Pierrot le Fou" has two. The first being the creepy cover of Pink Floyd's "On The Run" that plays during the scene where Tongpu is being experimented on, the second being Tongpu's deranged laughter.
Gren admits to Faye that "women aren't [his] style," and much of his interaction with Vicious could be read as jilted former lovers. At the very least, it's very much in Vicious' character to be aware of Gren's affections and manipulating him through them.
I Am Not Shazam: Tongpu, the AcrofaticMonster Clown, is often mistakenly called "Pierrot", after his alias "Mad Pierrot" and the episode's title "Pierrot le Fou", which literally means "Pierrot the Madman".
Seinfeld Is Unfunny: While this series is still among the pantheon of Anime Classics, some minor aspects are not perceived as innovative as they once were.
The Superlative Dubbing done by the producers of the English Language dub is something this series has been praised for. However given that the quality of dubbing in Anime has improved from the 2000s onward, though some people may disagree, this is a less than top selling point nowadays.
The Character of Spike Spiegel, while still one of the undisputedly popular characters of anime and possibly in all medium in general for his badassery and cool attitude, ends up coming across like a clone of many other countless other generic cool guys that are found in more recent works of fiction.