So you must have known there was going to be a twist otherwise every film you ever watch you must always look for a twist.
If you don't know there's a twist then you won't look for it and just let the film pan out.
If somebody told me there was a great twist in a new film they might as well have told me the ending.
Well, you would have to be blind to not know it had a twist.
In this case, it is telegraphed in the scene with the guards as he gets on the truck.
As the film goes on, it tries to bait you into it being one of 4 different ones.