Walter Koenig signed on to star in this film before total financing was secured.
Col. Jason Grant:
We don't take no shit from machines!
(At about 1:21:00) On the lander panel, when Grant and Mera are setting the self-destruct in the alien ship, the word Auxiliary is misspelled "Auxillary".
Near the end of the closing credits, audio is heard of Jason speaking to a NASA official about any possible debris of the spacecraft possibly falling to Earth.
The Japanese VHS runs a little bit longer than the North American version, but mostly features extended dialogue between Jason and his son.