Casting principal
Chris Christy
(segments "Twin Reflections" and "Teenage Twins") (archive footage)
Tim Christy
(segments "Twin Reflections" and "Teenage Twins") (archive footage)
Sean O'Brien
(segment "Identical Twins") (archive footage)
Tim O'Brien
(segment "Identical Twins") (archive footage)
Dave Karlstadt
(segment "Fraternal Twins") (archive footage)
Paul Karlstadt
(segment "Fraternal Twins") (archive footage)