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Harry Nilsson
Self - Narrator (archive footage)

Richard Perry
Self

Doug Hoefer
Self

Jimmy Webb
Self

Micky Dolenz
Self

Van Dyke Parks
Self

Una Nilsson
Self

John Lennon
Self (archive footage)

Randy Newman
Self

Mark Hudson
Self

Ringo Starr
Self (archive footage)

Yoko Ono
Self

Tom Smothers
Self

Dick Smothers
Self

Terry Gilliam
Self

Robin Williams
Self