It has been claimed that names on the list, gathered by supposedly "trawling the internet" for three minutes, were visible to TV viewers.
"If any viewer was able to identify anyone listed, I would like to apologise and stress that was never my intention," Schofield was quoted as saying by The Mirror deputy TV editor Mark Jefferies.
"I would never be part of any kind of witch hunt. Unfortunately there may have been a misjudged camera angle."
Cameron refused to look at Schofield's list and added: "I've heard all sorts of names being bandied around and what then tends to happen is, of course, everyone sits around and speculates about people.
"There is a danger, if we're not careful, that this can turn into a sort of witch hunt, particularly against people who are gay."