Wow, this is a weird claymation film chock-full of ideas and gags. One would have to watch it many times, and still discover something new in the next viewing. I try to imagine how the Soviet censor might have scratched his head...
Wikipedia reports that there was a scandal involving the main voice actor: "Sadalsky did not appear in the credits. Shortly before the final cut, the actor was arrested inside the Cosmos Hotel with a foreign citizen. The information against Sadalsky was reported to Gosteleradio director S. Lapin who ordered the removal of Sadalsky's name from the credits as a penalty for forbidden relations with foreigners." In the copy of the film available at archive.org, this wrong is somewhat righted by an extra credit after the end: "The camera crew thanks actor Stanislaw Sadalsky for providing the voice for the recording".
Wikipedia reports that there was a scandal involving the main voice actor: "Sadalsky did not appear in the credits. Shortly before the final cut, the actor was arrested inside the Cosmos Hotel with a foreign citizen. The information against Sadalsky was reported to Gosteleradio director S. Lapin who ordered the removal of Sadalsky's name from the credits as a penalty for forbidden relations with foreigners." In the copy of the film available at archive.org, this wrong is somewhat righted by an extra credit after the end: "The camera crew thanks actor Stanislaw Sadalsky for providing the voice for the recording".