[1] Douro, Faina Fluvial was first shown at the International Congress of Film Critics in Lisbon on 19 September 1931, where the majority of the Portuguese audience booed.

However, other foreign critics and artists who were in attendance praised the film, such as Luigi Pirandello and Émile Vuillermoz.

Again in 1994, Oliveira modified the film by adding a new, more avant-garde soundtrack by Luís de Freitas Branco.

[3] Oliveira was influenced by German filmmaker Walther Ruttmann's documentary Berlin: Symphony of a City, and Douro, Faina Fluvial was made in the same genre of city symphony films.

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