I've seen several movies based on real events that have a section about the level of similarity to actual events

Examples off the top of my head:

https://en.wikipedia.org/wiki/Argo_(2012_film)#Historical_in...

https://en.wikipedia.org/wiki/12_Years_a_Slave_(film)#Histor...

https://en.wikipedia.org/wiki/Spotlight_(film)#Historical_ac...

The german site has it too. That's why I was wondering.