Spoilers Ahead. If you haven't watched Fantastic Beasts: The Crimes of Grindelwald yet, please do not read further.
According to this and many other such fan pages, Minerva McGonagall, Harry's Transfiguration teacher was born in 1935 (although Pottermore only mentions October 4, and no year). Now, in The Crimes of Grindelwald, we see a "Professor McGonagall" when the Aurors come to question Dumbledore about the whereabouts of Newt Scamander, which must have happened at least in the late 1920s if not exactly in 1927, if we follow the timeline shown in Fantastic Beasts. The same professor is also seen in a flashback which may have happened around ten years before this incident, when Dumbledore is teaching Newt and Leta's class. This would have happened in the 1910s then?
I even conjectured that maybe this is a different McGonagall teaching at the time Newt was a student, but the credits show Minerva McGonagall! If she was born in 1935 and these events occurred in 1927 or so (and earlier in the flashback), she wouldn't even have been born yet. How come she is fully grown and teaching in 1927? Was this some Minerva McGonagall senior? An ancestor to our beloved Transfiguration teacher and headmistress?