Really very good English,  I would write it a little differently just to be a little more correct: 

"Get on Up"

Last night I saw this a (aquí ´this´sería correcto si hubieras puesto el enlace aquí mismo, despues de la palabra ´this´) James Brown biopic with my grandparents. Before the movie there was an interview with the director and the star (Tate Taylor and Chadwick Boseman). The movie was very interesting because it showed how life was in the 50s and 60s. My grandparents were very happy to recall their youth.

https://www.youtube.com/watch?v=guOS6ev6hQ0

http://en.wikipedia.org/wiki/Get_On_Up_(film).