This is an excellent film. First rate. It has an intelligent plot cleverly scripted by Samuel Taylor (Sabrina, Vertigo), based on Leon Uris's novel. Uris had probably access to inside information about the "Saffire" affair (whence "Topaz") and mingled fact and fiction as masters of his craft can do.
Hitchcock delivers suspense, humor, great cinematography, a story that unfolds with ease and relative verossimilitude. Karin Dor is very beatiful, and Frederick Sttafford cuts a fine figure of a man.
The bonus material includes an interview with Leonard Maltin, who shows great appreciation of the movie. However, he doesn't mention a factor which, in my view, stood in the way of its recognition when it was released and still stands now: Communist Cuba is presented as a place where torture is practiced, and its leaders are uncouth and ridiculous. The CIA men are the gooddies. Unforgivable in 1969, and even now, in Europe and it seems in the US where we must sing praises for "Comandante" and things like that. This is surely at least 70% of its lack of appreciation, and not the "transparencies" or the uncertanties about its ending.
One scene has been particularly praised, and it is only one among a score: when Cuban head Rico Parra (John Vernon) kills Juanita de Cordoba (Karin Dor). Not only the image is visually astounding, but the words: "You can't judge... not you" Rico says to Juanita before sparing her torture... bu shooting her. Also stunning the image where the two members of the Cuban resistance lie after martyrdom like Jesus and His Mother in Michelangelo's "Pietà". Wonderful movie, exiting, epic... without the excesses of the caritaturesque Bond series.