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.
Fridge Logic: Long time readers may sometimes be left asking why Doraemon didn't use his other gadgets to get himself/Nobita/others out of their predicament.
It has been noted that most if not all of Doraemon's gadget are second-rate and thus need a lot of repairs. It's just that the repair time "tend" to be during their adventure.
Germans Love David Hasselhoff : In Indonesia, being a Gateway Series to Japanese animation and manga in general. And HOW. Its popularity is close to Japan, with local TV channels till regularly showing reruns of the anime and the movies, almost every manga in the series localized and in reprint, and the series is often cited by Indonesians as their first.
It's also quite the hot stuff in Spain, having aired since almost as early as in Japan and still going strong.
Nightmare Fuel: The episode where Doraemon uses this moonbeam flashlight that turns anyone it shines on into a Werewolf. Doraemon scares Nobita after he retreats to his room after watching a scary movie.
More of them in the movies. The villains there are villains in every sense, and bring actual threats to the table.
The Magic World movie has the fuel by the truckloads. The devils are real (albeit as aliens, not in religious sense) and their home planet is nightmarish. The Big Bad is alien Satan, and the kids defeat him by piercing his heart... which is detached from his (apparent) body...
Heck, some of Doraemon's gadgets can be downright scary at times. For instance, the Dictator Switch allows its user to make anyone disappear. And not just out of sight, the person is gone and no one will ever remember that person even existed...yes, even the person's own mother. And in the chapter this gadget debut in , Nobita wound up making EVERYBODY disappear. Granted, the device is used to punish dictators and the effects are reversible but the fact that this device is sold to the public, it is very chilling.
Then there's the Devil Passport. What does it do? Well, it let's you get away with anything...and I mean anything. Granted, in the story, Nobita felt guilty after for what he had done when he used it but...remember that in the future, the gadgets are sold to the public which includes the Devil Passport...you make the connection.
In one chapter, Nobita bribes Doraemon to do his homework for him by giving him dorayaki. Doraemon accepts but is overwhelmed by the amount of work and enlists five copies of him from the future, each two hours later. The work was done but, as well as being beat up by his clones for obvious reasons, he had to be dragged out of bed to do the homework five times. While this is a comedic premise, his fifth time has him go absolutely insane, in a very disturbing way. Here's the story.
Sacred Cow: If your country has an eastern border in the Pacificnote Japan, Taiwan, ASEAN countries, etc., then you** will find it extremely difficult to find someone, anyone, who doesn't like Doraemon. Even if the modern anime fandom leans toward the dark and the edgy, hating Doraemon is unthinkable. The only other anime that gets this treatment is Sazae-san, and only in Japan.
Squick: In one story, Nobita's father speaks about a time when he was young and working in the fields, and ended up being nearly Driven to Suicide after he collapsed and was unable to finish the day's work. However, a girl "as beautiful as a lily," with long black hair, pale skin, and large eyes, appeared to him, smiled, and gave him a bar of chocolate, which was enough to bring him back from the Despair Event Horizon. Doraemon and Nobita decide to go back in time to see who this girl is. When they see Nobita's dad collapse, they decide to take him aside and have Nobita take his place. Nobita ends up having to shave his hair, and then his clothes get muddy and have to be washed. Doraemon sprinkles powder on him that makes his hair grow, and grabs him clothes from someone's washline. The clothes turn out to be a girl's dress, and the hair growth powder both makes Nobita's skin look pale and his hair look long, as well as the fact that glasses make his eyes look much bigger. Doraemon then realizes that Nobita is actually his dad's dream girl. They naturally decide not to share any photos of this scene when they get back to the present. Think about it - this basically means that Nobita's dad has had a crush on his own son without realizing it.
And the episode where Shizuka adopts a doll and asks Doraemon to make her a sentient one so they can find its owner...
The episode where Nobita accidentally called a Snow Spirit. They started as a friend until the spirit became a Clingy Jealous Girl towards Nobita and forced him to play hours in a snow storm. Nobita caught a very bad fever as the result. Knowing she really liked Nobita and felt bad that Nobita got sick because of her, she sacrificed herself to heal Nobita's fever and in exchange she had to vanished with the winter and spring came early instead.
The movie where a portal to another dimension forms under a floor tile in Nobita's room. Doraemon finds a love interest there, and said portal gets destroyed at the end of the movie, severing Doraemon from ever being able to visit his love interest ever again. The movie's Award Bait tear jerker of a theme song (played as the portal vanishes) brings on the full effect.
And of course, the final chapter of Volume 6 of the manga, as well as the first chapter of Volume 7. Which was adapted into a half-hour long TV special in two parts.
Some of the fan-written endings mentioned above as well. Especially the infamous "happy ending", when the repaired Doraemon wakes up for the first time in 35 years, and Nobita and Shizuka both switch to looking just like they did when he was last awake and glomp the confused cat. There is a reason the fanbase were so convinced it was canon that they were emailing the publisher asking them to verify and/or animate it.
For those that have watched Nobita and the Steel Troops, the remake Nobita and the New Steel Troops ~Angel Wings~ has a major one near the end with a stronger impact than the original film. Lilulu had performed a Heroic Sacrifice by rewriting Amu and Emu's programming after going back in time to 30,000 years ago, thereby rewriting Mechatopia's history. As a result, she and Pippo, being of the present, Disappears into Light due to the changes. Their final lines has them sharing a scene, switching between the two. It's Heartwarming to see how far they've come from hating humans; and heartbreaking, with Shizuka desperately begging for Lilulu to not disappear and Nobita helplessly holding Pippo.
Lilulu: Shizuka... I'm glad- Pippo: -to have met all of you. Lilulu/Pippo: If I am reborn... Lilulu: ...as a robot angel... Nobita: Pippo! Pippo:' *happy laugh* That name... I love it... Lilulu: ...let's be friends, okay?