I happened to have extremely close links with the R&J show 3-4 years ago on the premium line side of things. No-one was innocent in it, but the worst were the production company behind the show.
Basically, you have lines opening and closing at certain times. They open a few minutes before the question is read out, and remained open until after the show. As soon as the question was read out, winners would be selected and sent to the production company, not just one but 20-30 over the course of 40 mins. This is necessary so that the production company can vet the caller to make sure that they're not deranged. However they had a tendency to select one of the first callers, so when R&J asked people to keep phoning in, chances are the production company already had in mind who they were calling back.
So R&J then announce that the lines are closed and say, 'Lets see who we have on the line", IMMEDIATELY. There is no way anyone calling a few minutes earlier could have got on because there was no chance to even see if they had the question correct, let alone forward them to the production company and vet them for suitability. This would need at least 5 minutes, and people knew that. Heck, even the public should have been able to work that one out.