"Flying down to Rio" from 1933, with Fred Astaire etc. Funny to see Copacabana Palace almost alone at the beach stretch!
"L'Homme de Rio"/"That man from Rio" from 1964, with Jean-Paul Belmondo etc.
"Ônibus 174", documentary about the corruption, brutality and lack of education of the police force.
I have only seen part one of "Tropa de elite", but I recommend it.