I can't find any YT video with it, I'm shocked. I think it was changed around 2005-2007 if I recall. Scene 11, the last scene actually has a dome screen. There was a video projector in one corner with a custom fish-eye lens (I might have this video clip... I'll look for it! :shades
. As you turned around on the turntable you would watch the video above and then the room came to life with faux fire surrounding you and hot steam cannons (from below the ride track as well as from track left and right) would go off, then at the end, the two (track left and right) LN2 (still being used today) cannons would spray the ride vehicle as it left the room. That's basically it.
This is a picture from a 2014 article but was taken just before the opening of the ride in 2004. They were the opening crew for the ride. Sadly the guy in the second row passed away a while back. I believe the guy in the front row far right still works at JP.
One more thing, see how the vehicle doesn't have the metal handrails on the front? It was added after a few incidents of people (walking into the first row) would fall into the track area. Don't ask me why, but they did and the rails were added thereafter.