Here’re a few questions that Oda got wrong in the OP Knowledge King contest (he got 19 out of 100 questions wrong)
43, The order in which the “Mysterious Four” were defeated by the “Straw Hats”
1, Moria 2, Perona 3, Hogback 4,Absalom
Correct Answer: 4231
Oda’s Answer: 2431
44, The number of shadows Luffy was imbued with in order to become Nightmare Luffy
Correct Answer: 100
Oda’s Answer: 1000
45, the sword(s) that Zoro used while fighting Ryuma
A, Shusui B, Wado Ichimonji C, Yubashiri D, Sandai Kitetsu
Correct Answer: B and D
Oda’s Answer: B and C
47, the correct order of the levels of Impel Down, starting from Level 1
1, Blazing Hell
2, Crimson Hell
3, Starvation Hell
4, Wild Beast Hell
Correct Answer: 2431
Oda’s Answer: 2341
51, Who’s the first one to attack during the Summit War? Answer with their full name.
Correct Answer: Edward Newgate
Oda’s Answer: Marco
Oda also got the questions on the name of Robin’s mother and the name of the eldest daughter of Charlotte family wrong because, like 51, the question said to answer with the character’s full name, yet he only answered Olvia/Compote.