Other mistake: When Loki gets up from being thrown during the "get help" scene, he seems too far to the left of the screen (Thor's right). Thor is still looking down to his left at the fallen guards, and in the previous shot we saw that Loki fell amongst them as he knocked them down.

Thor: Ragnarok (2017)
1 other mistake
Directed by: Taika Waititi
Starring: Cate Blanchett, Benedict Cumberbatch, Idris Elba, Chris Hemsworth, Tom Hiddleston, Tessa Thompson
Continuity mistake: When Thor and Loki are in front of the Shady Acres care home, an old man wearing a black hat passes behind them but in the next shot a woman is there instead.
Grandmaster: Revolution? How did this happen?
Topaz: Don't know. But the arena's mainframe for the Obedience Disks have been deactivated and the slaves have armed themselves.
Grandmaster: Ooh, ah, I don't like that word.
Topaz: Which? Mainframe?
Grandmaster: No. Why would I not like mainframe? No, the "S" word, the "S" word.
Topaz: Sorry, the prisoners with jobs have armed themselves.
Grandmaster: [Smiles] OK, that's better.
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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.