The theme of this movie is that people can't help but revert to being caring and polite. It is quite sweet to watch even abductors and abductees treating each other with kindness, simply because they forget themselves and act instinctively. A typical joke of this form was the kidnapper preparing a gourmet meal for his victim, and fussing over whether she enjoyed it.
It is not the wild crazy comedy you would expect of Robin Williams. It is more the nightmare of how a small crime is forced to escalate.
There is a lot of quite grisly violence. People do it without thinking, then later think better of it.
The Holly Hunter character is a complete original. She is a bit nuts, but very pleasant.
Even the young ditzy phony telephone psychic loves her clients, and gives them quite reasonable advice.
It does not tie up loose ends. You are always guessing why people are doing what they are. There is no Agatha Christie ending to explain it all.