Concerning the involvement of Norstein in the making of this film, his own words about it in this recent interview might be of interest. Relevant excerpt (30:35-31:05):
> "ΠΠΎΡΠΎΠΌ ΠΌΠ΅Π½Ρ ΠΠ²Π°Π½ΠΎΠ²-ΠΠ°Π½ΠΎ ΠΏΡΠΈΠ³Π»Π°ΡΠΈΠ» Π²ΡΠΎΡΡΠΌ ΡΠ΅ΠΆΠΈΡΡΡΡΠΎΠΌ Π½Π° ΡΠΈΠ»ΡΠΌ "ΠΡΠ΅ΠΌΠ΅Π½Π° Π³ΠΎΠ΄Π°". ΠΡΠΎ ΠΏΠΎ Π§Π°ΠΉΠΊΠΎΠ²ΡΠΊΠΎΠΌΡ, Π΅Π³ΠΎ Π°Π»ΡΠ±ΠΎΠΌ "ΠΡΠ΅ΠΌΠ΅Π½Π° Π³ΠΎΠ΄Π°". Π― ΡΠ°ΠΌ ΠΎΡΠ΅Π½Ρ... Π’Π°ΠΌ Π±ΡΠ»Π° Ρ ΡΠ΄ΠΎΠΆΠ½ΠΈΠΊ ΠΠ°ΡΠΈΠ½Π° Π‘ΠΎΠΊΠΎΠ»ΠΎΠ²Π°. Π― ΡΠ°ΠΌ ΠΎΡΠ΅Π½Ρ ΠΌΠ½ΠΎΠ³ΠΎ ΠΊΠ°ΠΊ ΡΠ΅ΠΆΠΈΡΡΡΡ ΠΈ ΠΏΡΠΈΠ΄ΡΠΌΠ°Π». Π ΠΊΡΠΎΠΌΠ΅ ΡΠΎΠ³ΠΎ Ρ ΠΏΠΎ ΡΡΡΠ΅ΡΡΠ²Ρ Π±ΡΠ» ΠΎΡΠ½ΠΎΠ²Π½ΠΎΠΉ ΠΌΡΠ»ΡΡΠΈΠΏΠ»ΠΈΠΊΠ°ΡΠΎΡ, ΠΏΠΎΡΠΎΠΌΡ ΡΡΠΎ ΡΠ°ΠΌ, Ρ ΠΎΡΡ ΡΠ°ΠΌ Π½Π°Ρ ΡΡΠΈ ΠΈΠ»ΠΈ ΡΠ΅ΡΡΡΠ΅ ΠΌΡΠ»ΡΡΠΈΠΏΠ»ΠΈΠΊΠ°ΡΠΎΡΠ°, Π½ΠΎ ΠΏΡΠ°ΠΊΡΠΈΡΠ΅ΡΠΊΠΈ 90% ΡΠ½ΡΡΠΎ ΠΌΠΎΠ΅ΠΉ ΡΡΠΊΠΎΠΉ."
> "Then, Ivanov-Vano invited me to be a second director on the film "The Seasons". It is based on Tchaikovsky, on his suite "The Seasons". The artist [maybe "art director"?] on this film was Marina Sokolova. As a director, I brought in a lot. And aside from that, I was basically the main animator, because β although there were three or four of us animators β in practice, 90% was filmed by me."