How did they mess it up?
The answers were printed on the back.
http://news.bbc.co.uk/1/hi/education/7414129.stm
Now, why couldn't they do this with my exam...?
OCR are incompetent. Edexcel or AQA are the way to go. No teacher in the UK takes OCR seriously. This is no surprise at all.
That's what they mean when they say you should make sure you read the entire paper.
Reminds me of some of my exam hurdles. Every once in a while, I remember seeing something in the paper that prompted towards the answer. You gotta use everything (within morality) at your disposal to pass an exam.