Slutet var avsiktligt lämnat tvetydigt. Det var en originaländring där Loki flyttade bilen och hittade Keller men filmskaparna ändrade det med ändamål och studion lämnade det i sista hand. Slutet visar att Loki hör visselpipan, men vi ser honom inte hitta Keller. Så det kan vara att han bestämmer att det bara var vinden, eller det kan vara att han hittar honom men bestämmer sig för att lämna honom till hans öde, eller det kan vara att han hittar och räddar honom. Jag tror att den mest sannolika slutsatsen som vi får veta om Loki är att han efter att ha hört flöjten undersöker området mer tills han hittar Keller och räddar honom från hålet och sedan går Keller i fängelse för vad han gjorde mot Alex.
Här är några kommentarer från en buzzfeed-artikeln intervjua manusförfattaren och ta itu med dessa frågor.
Did the whistle work, for God's sake? ... I talked to Prisoners screenwriter Aaron Guzikowski about the ending.
On the decision to end the movie with a cliffhanger:
"Oddly enough, that's how it was in the script when it was bought. And it never really changed. When we were shooting, we did shoot a version where it goes a little beyond where the fade out is. There's a version where he moves the car and sees Hugh down there, and so on. None of us really wanted to do that version, but we wanted to make sure we had it in case once the film was put together it seemed like it really needed it. But after testing the film with the ending it has now, everyone decided that was definitely the way to go. Joel Cox, the editor, felt very strongly about it. I just think that's the moment when the movie is ready to end."
And the ending that was shot but didn't get used was...
"They move the car. They see he's down there. You know he's going to be taken out of the hole. I like it much better being ambiguous. Even though you assume that's what's probably going to happen, I like that there's a small chance that he's not going to get him out of there for whatever reason."
*But Detective Loki is so tenacious during the movie. Is there a scenario where he'd actually walk away?
"No, I think there's a small percent chance that for some strange reason he might decide not to get the guy up. In my mind he would: Those two guys have a strange connection that they form over the course of the movie. That seems to be the logical next step for Jake's character at that moment."*
On why the studio was (atypically) fine with an oblique ending:
"I was very surprised that we were allowed to keep that ending. I was surprised I was able to get the movie made, actually. It's a pretty dark script. Especially ending the way it does. It's definitely a testament to Alcon, the producers on the movie, sticking by the script and not wanting to make it into something it wasn't."
In a fantasy world where we saw what happened to Keller after he's out of the hole, things would not have gone well for him:
"I think, unfortunately, he would go to prison. The final irony — his father was a prison guard, and the whole movie is metaphors of people's internal prisons, external prisons. I believe that's what would end up happening to him: that he would go to prison for some time."