Ramanujan

 There is a YouTube short about the Indian mathematcian Ra?? and an English mathematician competing doing multi-digit arithmetic in their heads.  I think that seriously misrepresents things.

Yes — if the short is presenting Ramanujan as essentially a human calculator competing with an English mathematician, I think your objection is quite justified.

Ramanujan certainly had extraordinary computational ability. He had an exceptional memory and was capable of remarkable numerical manipulation. But that wasn't what made him Ramanujan. His extraordinary achievement was mathematical insight: seeing relationships, constructing identities, discovering series and formulas, and producing results in number theory and analysis that other first-rate mathematicians found astonishing.

And there is an important distinction between arithmetic ability and mathematical ability. A person can become extraordinarily fast at multiplying large numbers mentally by learning techniques and exploiting patterns. That's an interesting cognitive feat, but it tells us rather little about someone's capacity for original mathematics.

Indeed, the famous Ramanujan–Hardy relationship makes the point rather nicely. Hardy wasn't impressed because Ramanujan could calculate faster than he could. He and Littlewood were confronted with a collection of theorems and formulas in Ramanujan's letter, and what astonished them was the originality and depth of the mathematics.

There is also a slightly amusing historical irony here. Ramanujan's reputation has repeatedly been turned into a sort of "mysterious Indian calculating genius" story. Contemporary and later accounts sometimes emphasized his almost supernatural numerical powers, whereas mathematicians were interested in something much deeper: his ability to arrive at mathematical structures by extraordinarily unconventional routes. The MacTutor history of mathematics, for example, explicitly describes the mysterious quality of his thought processes, not merely his ability to perform calculations.

So if the short says something like "Indian genius beats English mathematician at mental arithmetic," it is probably taking a fascinating but relatively peripheral talent and making it stand for his genius as a whole.

It's rather like portraying Einstein by having him win a contest in calculating square roots. Impressive, yes. But you've selected the least interesting thing about the man.
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