The disclaimer added: "No payment was made for any of the interviews conducted by (ABC News correspondent) Martin Bashir or ABC News."
ABC-produced segments were interspersed with the British footage throughout the special and the programme did not specify which interviews had been paid for and which had not.
But ABC, a unit of the Walt Disney Co, dismissed suggestions that viewers might be confused. The network said its own segments were distinguished from the British material using on-screen graphics.
"It was made quite clear what came from the British documentary and what came from original ABC News reporting," ABC News executive vice president Jeffrey Schneider told.