Harry Potter fans have noticed a huge error in the new Fantastic Beasts movie - and they're not happy.

The cast list for the second film, The Crimes of Grindelwald, was recently released and it included someone rather unexpected: Professor McGonagall. However, fans were quick to point out that the dates don't add up - as Crimes of Grindelwald is set in 1927, and everyone's favourite fictional transfiguration teacher wasn't even born then. Based off of the fifth book, The Order of the Phoenix, fans have worked out that Professor McGonagall was born in 1935. She says in the book that she started working at Hogwarts in December 1956, having worked for the Ministry of Magic for two years after her graduation. This, in turn, would mean that she graduated Hogwarts in 1954 - and, assuming she wouldn't have had to redo any years, she would have started Hogwarts in 1947. Which doesn't make much sense if she's meant to be a witch in her 20s or 30s in the upcoming Fantastic Beasts film. https://twitter.com/jellyfishlemon/status/1059742344919085056 https://twitter.com/heyrayuuuh/status/1060066883917869056 https://twitter.com/Meliachipics/status/1058440267064397826? https://twitter.com/AslaugRagnHarb/status/1058486030582640642 https://twitter.com/tomfev/status/1059846691296288768 https://twitter.com/dancinxqueen/status/1058875270810255362 https://twitter.com/_potterhead7_/status/1059373241423151104 Fiona Glascott, who previously starred in the movie Brooklyn, is listed as playing Minerva McGonagall in Fantastic Beasts: The Crimes of Grindelwald.  And some fans pointed out that it may not be that McGonagall - and that the Minerva McGonagall she is playing could be her mum or her grandmum, and they just share the same name. Hmm...