Tropes A to B (Adaptation-Induced Plot Hole, Arc Villain, Berserk Button, Beware the Silly Ones, Big Brother Instinct, Bowdlerise, Break the Cutie) | Tropes C to D (Call-Back, Chekhov's Gun, Cliffhanger, Combat Pragmatist, Crouching Moron, Hidden Badass, Curb-Stomp Battle, Dark and Troubled Past, Deconstructed Character Archetype) | Tropes E to F (Early Installment Weirdness, Famous Last Words, Foreshadowing) | Tropes G to J (Heart is an Awesome Power, Hypocrite) | Tropes K to M (Laser-Guided Karma, Logical Weakness, Mass "Oh, Crap!", Moral Myopia, Muscles Are Meaningless) | Tropes N to P (Nice Job Fixing It, Villain, Oh, Crap!, O.O.C. Is Serious Business) | Tropes Q to S (The Reveal, Shout-Out, Spanner in the Works, Superpower Lottery) | Tropes T to Z (Wham Episode, Wham Line)
- Sanji's origin story gets one in the anime thanks to some censorship. Originally, Zeff saves a child Sanji and then washes up on a deserted island with him, and gives him some food which Sanji is forced to ration, while keeping hold of a big bag that Sanji assumes is filled with food. When Sanji eventually tries to jump him for the food, he learns that it's filled with treasure and that Zeff gave him all the food they had, and survived by eating one of his own legs. In the anime, this is changed so that Zeff lost his leg while saving Sanji... which Sanji apparently never noticed even when the two were directly talking to each other and Zeff didn't bleed at all when his leg was freshly severed as he somehow got to where he was without leaving a bloody trail to tip Sanji off.
- In a mini-arc adapting Coby and Helmeppo's cover story, the two are said to have sailed over Reverse Mountain to Marine Headquarters with Garp. In the post-Enies Lobby arc, it is revealed that Marine ships can cross the Calm Belt with special Seastone equipment. In the anime, the newspaper photo is hand waved away as a deception for the press. Granted, much like Luffy, it is perfectly in character for Garp to intentionally take a longer and more dangerous route simply because it seems like more fun.
- The Warship Island Filler Arc makes two:
- When Zoro easily cuts through steel chains, despite it being a plot point in the canon Alabasta arc that he couldn't yet cut steel. Second is that all the Strawhats meet Ryuji, a dragon, which makes Zoro's comment to Ryuma in the Thriller Bark arc that he doesn't believe in dragons seem completely stupid.
- The arc involves the Straw Hats meeting a dragon and fighting to protect it. In the Punk Hazard arc, the crew meets a dragon for the first time, with all of them expressing surprise as they have never seen one before. Whoops.
- At the end of the Warship Island Arc, Nami outright murders the Dragon-in-Chief by knocking him into the sea. Cut to the Dressrosa Arc where Nami considers the idea of tossing a fruit user into the ocean to be too cruel.
- Another one was when a filler episode in the anime-only portion of the Davy Back Fight arc had Chopper use two Rumble Balls a short time apart without consequence. During Chopper's fight with Kumadori in the Enies Lobby arc, it's shown that taking more than one within six hours has dangerous consequences; taking two should have made him lose control of his transformation. The filler arc was made before that particular weakness was revealed in the manga.
- At the end of the G-8 Filler Arc it is revealed that Vice-Admiral Jonathan was Admiral Akainu's protegé. At the time the filler arc aired, the manga had only revealed the nicknames of the Admirals, and therefore nothing about the personalities of Akainu or Kizaru were known. Jonathan was shown to be a pretty relaxed guy who respected the Straw Hats, held no grudge towards them and was actually glad that they improved the quality of G-8's soldiers and staff members. Akainu is THE General Ripper of the series, willingly executes deserters right on the spot, was responsible for the death of innocents just to make sure that no criminal was hiding amongst them, and absolutely despises pirates. It's very unlikely that the two of them would ever get along, let alone have a working teacher-student relationship.
- In the Impel Down arc, the scene in the control room was extended and added Bon Clay destroying the controls for the Gates of Justice. It wouldn't be big a deal if Blackbeard were not still deep in the prison, which means that Bon Clay's interference should have prevented Blackbeard from escaping the prison and arriving at Marineford.
- During the Reunion Arc (the first arc to take place after the two-year Time Skip), the anime had Chopper chew a Rumble Ball before transforming into the forms that normally require it, just short of Monster Point. This contradicts a later revelation in the following Fishman Island arc that, thanks to his two years of training, he now only needs a Rumble Ball for his Monster Point form, and in fact, the original manga scene didn't have him take any Rumble Balls at all. When a fan brought this up, Oda Hand Waved it by saying that Chopper likes to eat candies that look like Rumble Balls.
- In the Fishman Island Arc, the anime adds a flashback scene of Arlong saving Hody Jones’ childhood Fishman District gang from human slave traders. This contradicts the big reveal of Hody Jones’ reason for hating humans: Humans had never done anything to him, he was just told to hate them from when he grew up.
- In Dressrosa, when Doflamingo is about to offer Law a Sadistic Choice at gunpoint, the anime has him address Law by his full name, "Trafalgar D. Water Law". This is despite the fact that Law never told Mingo his full name, only saying that he's a "D" like Luffy... something that Doffy did not even know at all until Law mentioned it. Unless Baby 5 or Buffalo told him, Doflamingo should have had no way of knowing about the "Water" in his name.
- During Kawamatsu's flashback thirteen years prior to the Wano Arc, the anime adds a brief scene showing Kaido and his top brass, Who's Who among them. This doesn't make any sense in hindsight, as it's revealed that up until twelve years ago, he was still a member of CP9.
- In the manga, Hawkins tells Drake that "a certain man" has a one percent chance of surviving until tomorrow, but the anime translated this as Hawkins saying that it was Drake who had the one percent chance. As of Chapter 1052, we know that Hawkins was actually talking about himself.
