Solaris (1972) Easter Egg - Solaris Region 2 DVD

In the archive section of the DVD if you choose the biography of Stanislaw Lem and then choose archive again (under his photo), instead of taking you back to the previous menu, it shows a clip of another sci-fi film by the author - 'Pilot Pirks' - which isn't advertised anywhere on the DVD packaging.
Also if you go to the biographies of the director, and composer you'll find three trailers for 'Anrei Rublyov', 'The Mirror' and 'At home among strangers'...