Marita Lorenz later years were chaotic, including an abortion she blamed on the CIA. Overall history is a little murky, but it seems written for dark entertainmant rather than history. Consider for one example, the depiction of pictures, posters, signs, etc. of Mantegna/Castro everywhere, including in her hotel room. There are no likenesses of Castro to be seen anywhere in Cuba, no statues, certainly no airport named after him.
That silly crap wherein the alleged Castro line goes, "..the Communists fought with us in the sierras". Horse-pucky! The truth, for which the producers had no regard, is that the Communist Party of Cuba opposed revolution -whether Castro's or anyone elses. Nor was there any "my wife" Castro refers to at one point. Castro's ignoring of the pleas of a woman imploring him about her son, with "I don't even know her" was more crap possibly written by Republicans, as was the depiction of Castro's personality. Such is not why Cuba had a popular revolution from within, lead by the most popular politician in Cuba before Batista's coup d'etat of 1952. Castro sued Batista for illegal succession before turning to revolution... a movement so popular with Cubans that a mere 18 revolutionaries who survived their landing grew so popular that that they overthrew a widely despised government, doing so without Communist support. This movie attempted to distort history.