Why did Trent . . .
try to dump Loren's body into the acid? If they wanted Nora to take the fall for his murder, they needed his dead body, didn't they? And I very much doubt that at that time the skeleton could have been ID'd as his from DNA or anything else.
Even if the police went along with its being Loren's skeleton, they'd have to wonder how Nora managed to get it there.
I'm probably over-thinking it; they needed a way to off the shrink, I guess. By the way, the picture went black pretty abruptly on the DVD I have just as Trent started to drag him toward the "pool." I know this film has been chopped up a lot - was a scene cut from what I saw? (Which did not include Trent's murder.)