I was at Steinway when they recorded part of Episode 7, where Greg and Gary went face to face.
They had maybe a dozen people. I counted at least 3 cameras, and one mounted on a jib crane. As for the lighting, almost every ceiling tile on the main floor had a light clamped through it. Soft boxes on c-stands.
The shooting was continuous, meaning the director just kept the cameras rolling and let the players do their thing. Afterwards, on a different table they would set up and re-shoot some shots. That could be where some of the gaffs come in. Have Finnegan shoot a shot, say with Centennials, catalog it as stock footage, and months the editing digs it up (not properly tagged) staff inserts it in to represent Emily or Jennifer shooting with Aramith TV Pros.