Conversation so far:
who or what are the Warrens?
Ed and Lorraine Warren on the Sally show in 1992.
What do they have to do with Nickell?
His insistence on documented facts led to a heated exchange with Ed and Lorraine Warren on the Sally show in 1992.
was Nickell an actor?
" to describe his work, his evidenced-based investigations of paranormal events has not yet uncovered any miracles, ghosts or monsters.
Did he work on the show?
CANNOTANSWER.
What did the warrens have to say?
Warrens appeared on Sally Jesse Raphael's talk show with the Snedeker family, whose reports of ghosts and demons led to the 1992 book, In A Dark Place.
Were there really paranormal activities going on?
I think the Warrens have not met a house they didn't think was haunted.
...
Did Nickell think they were lying?
cite the Warrens as an example of exploitative and harmful charlatans.
He told Blake Smith, host of the MonsterTalk podcast.

Question: what ese?
Self-contained rewrite: what else did the Warrens do?