What was removed between the Japanese and English releases of "Odin: Photon Space Sailer Starlight"?
From Wikipedia:


  Many earlier anime theatrical films had slow deliberate pacing resulting in running times that were over two hours. Odin: Photon Sailer Starlight, whose original runtime was two hours 15 minutes had a pre-credits sequence, numerous surrealistic special effects scenes, lengthy dialogue scenes, silent moments, as well as a musical ending (special appearance by Loudness, the band who performed some of the music numbers), all of which were cut resulting in a 90 minute English dub.


So the answer appears to be "All of the above".

(I've not seen the movie yet.)