Revealing mistake: During the fight in the forest with Heimdall and Hela's soldiers, he uses the sword but the tree is cut before the hit, and the soldiers on the right fall before the hit too.

Thor: Ragnarok (2017)
1 revealing mistake
Directed by: Taika Waititi
Starring: Cate Blanchett, Benedict Cumberbatch, Idris Elba, Chris Hemsworth, Tom Hiddleston, Tessa Thompson
Continuity mistake: When Thor speaks with Valkyrie in Hulk's room, he makes his presence known by leaning on the end of one of the drinks racks. But in the following shot, he's moved a few steps back. (01:10:20)
Trivia: When Thor is strapped in the chair we can hear the music from the original Charlie and the Chocolate Factory; specifically an instrumental version of Pure Imagination.
More questions & answers from Thor: Ragnarok
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Answer: If other people are worthy, they can gain the power of Thor (this is something that has happened in the comics), but Thor can muster that power alone. In his case, the hammer simply allows him to focus his powers.
How come then that in the first movie when Odin wants to remove Thor's power he "confiscates" Mjolnir? If Thor's power is intrinsically inside him, how could Odin remove it? Then, he reacquire those powers only after holding Mjolnir again, which implies Thor's powers come from Mjolnir. This is poorly explained in the movies.
Epigenis
"Poorly explained" doesn't make it a mistake. Odin suppressed Thor's innate powers and removed the hammer both symbolically and to prevent Thor from using it to reacquire his powers.