- The movie is based on the novel by Polish author Stanislaw Lem.
- A number of sources claimed that Soviet officials withheld the 165 minute version from export. Mosfilm did issue this version for export and subtitled prints were being shown in the United States in 1973.
- This was the most widely seen of Andrei Tarkovsky's films outside of the Soviet Union. However, Tarkovsky himself reportedly considered it the least favorite of the films he directed.
- A print was screen at the Cinema Village theater in New York City in the mid-1980's that combined an English-dubbed version of the film, with sequences from a Russian-language print. This version also featured cheesy, 1970's era titles. Around this time, this was considered the most complete version of 'Solaris' available in the United States. It was not until the re-opening of New York's Film Forum theatre in 1989, that the complete and uncut Russian-language version was shown theatrically in the States.
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