You can see it in my vid.  Stages 1,2,4,6,7 are "Shooting Mode".
Stages 3 and 5 are "High-Speed Mode".
They are basically the same, but in high-speed the scrolling is much faster, 
and the enemies are faster too, so it points them out to you.  Also the HUD 
changes on these levels.
Also, I managed to to beat the game.  The Final Boss sequance is AMAZING.
Totally insanity, couldn't have asked for a better way to end it.
Tried Side B, and it's just a video.  Basically highlights from the game, but for use 
with the 3D goggles.  Just a 3D vid, no 3D game sadly.