I got it yesterday, it's really a lot of fun.
The first time you have to interrogate someone, you're required to start the interrogation over again from the beginning if you predict wether the person is teling the truth or not wrongly. That was difficult, and took a while for me to get passed that. However, after that, when you're interviewing or interrogating people, even if you get it wrong you'll just move past it, and at the end of the interview/interrogation it'll tell you how many you got wrong. I get quite a lot wrong, but have still managed to solve the cases quite quickly based on the other evidence. I guess I'm good at "putting things together".
I recommend it, it's great fun.
Yes, I know the bit your talking about I was on that bit for about 1/2 hour it became a process of elimination for me......
But I am thoroughly enjoying the game on Xbox.