A man becomes obsessed with facts and events that have been collectively misremembered by thousands of people. Believing the phenomena to be the symptom of something larger, his obsession eventually leads him to question reality itself.
«The Mandela Effect» (2019) subtitles file download
The fantastic movie based on the real socio-psychological effect
If you look at Wikipedia, you can learn a lot about the 'Mandela Effect', including many examples from history, including very recent. The filmmakers wrapped a whole film around this interesting socio-psychological effect, not shying away from their own fantasies and conjectures.
When watching, for some reason, the thought is constantly spinning that the main character has no effect with a beautiful name, but a banal fear of accepting the tragic reality and the desire to change it, which led to a mental disorder. Probably, it would be possible to slightly change the plot and show that all these fantasies occur with a client of a mental hospital who could not come to terms with the death of his beloved daughter, who died due to his negligence.
As a result, it turned out a movie, with special effects and cliches, which at times brings back to the 'Matrix' but, of course, does not reach the classics. Cinema may be to the taste of fans of the genre, glorified by the 'Matrix' that reality is not at all what we see.