That was incidental to other items inserted or created for “dramatic” purposes. They have the Queen and Mary meet in a drying shed in northern England as Mary is preparing to come to England.
In reality, they never met.
In that meeting they have Mary insulting the Queen in her own kingdom claiming that she is actually more a Queen of England than Elizabeth, a position that would not have made Elizabeth hesitant about her treatment in the following decade as she was in reality.
They have Mary firmly self-guided and mentally tough with Elizabeth the opposite. I doubt any historian would lay it out that way.
Correctly they have Bothwell less the hidden love that many earlier depictions had him — that is sound with the latest understandings. They correctly show John Knox for the zealot he was at the time, IMHO from my readings.
You either enjoy seeing some of these period pieces flaws and all or you go to another comic book movie or the third episode of SDT adventures of our youth culture.
The best (again my opinion) historical drama in the last three years is PBS’ Wolf Hall (which is also an interesting read — volume 3 next year). Buy it and watch it at home.
Am watching the first season of JAMESTOWN, which is a bit PC/"feminist", but not horridly so. Well worth watching; IMO.