In regards to the insane ending....
I've read some of the other posts in here, and i don't know about you guys but i never took the ending that literally as it appeared. Afterall, how the hell could 1 tiny chip implanted in the brain, somehow "Grow" and turn her body 60%+ mechanical? It was just a CPU processor, not alien or supernatural technology.
I thought of it more as another weird dream sequence, and since they ended the movie on that note, kinda running away from having to explain it. I think the ending is open to individual interpretation.
In which case i figure it was just another crazy dream sequence, since it was totally Impossible, improbable, and just pointless for that to have even happened. After all both Sam & BB were friends of the main character and were sadly separated from him, so it makes no sense that their sudden, "magical", combined Sentience would see fit to kill him like that.
Well either way, Loved the movie & the DVD release, it is an underrated gem from the 80s and unique enough from your average horror flick. Not to mention the infamous basketball scene made for a truly unique character-death. (Wow Kristy swanson sure was gorgeous in this one too!)