Continuity mistake: When Sean Penn enters his apartment for the first time the light switch is on, then after a cut away the light switch is off. (00:30:20)
Character mistake: In the beginning of the movie, Simon Broome and Xola speak in English and Xola acts as the only speaker of Ku. He confirms to Simon that the three young boys are Ku but if Simon grew up as a Matoban like Silvie, he would have been fluent in Ku as well.
Chosen answer: At this point, she has set her mind on killing the African leader and knows she'll likely be killed immediately afterwards (police, bodyguards, etc). She's writing her name in anticipation of her death.