Maybe some people have non-disclosure agreements, but otherwise...
What was it like?
How staged were scenes where people apparently meet the presenter for the first time or are otherwise surprised?
When shows imply a sort of friendship with the presenter, how made up did you find that was? Is there actually zero contact apart from when they turn up to film, or, during shows that cover longer periods of time (like several weeks or months) do they sometimes send emails or texts to ask how people are getting on?
Are there presenters who are arsey off camera but expect to be treated like your new best mate on it?