John F. Kennedy is shown as President of the U.S various times during 1960: the assassination attempt on Romulo Betancourt (June 1960) and the assassination of the Mirabal Sisters (November 1960). However, Kennedy was not elected until November 1960 and wasn't in sworn in until January 1961.
On June 2nd, 1962, as Lt. Amado García is being ambushed, President Joaquin Balaguer's eulogy of Trujillo is being broadcast during the funeral of the Dictator. However, what we actually hear is that speech, inter-cut with Joaquin Balaguer's first inaugural address from July 1st 1966.
The car Trujillo rode on his last night was a 1957 Chevrolet Bel Air. However, in the film, a 1956 model is used.
The movie is set in 1960-61, however, the military bus is an early 90's model.
The holster being worn by Amado at the beginning of the movie is a Bianchi M12 nylon military holster designed for the M9 Beretta pistol in the 1980s.