Claim: Straight Outta Compton saw The D.O.C. (real name - Tracy Lynn Curry, born June 10, 1968, and a member of the hip hop group Fila Fresh Crew) while only working as a guest, rapped the opening verse, and wrote some lyrics for Dre's most likely.
Evidence: The one guest is The D.O.C., who raps the opening verse of "Parental Discretion iz Advised." The D.O.C. (guest) – rapping (one song) Tracy Lynn Curry (born June 10, 1968), better known by his stage name the D.O.C., is an American rapper, songwriter, and record producer. In addition to a solo career, he was a member of the hip hop group Fila Fresh Crew and later collaborated with gangsta rap group N.W.A–where he co-wrote many of their releases–as well as Eazy-E's solo debut album Eazy-Duz-It. wrote some lyrics, perhaps mainly Dre's lyrics, Cube wrote some of Dre's lyrics and nearly all of Eazy's lyrics.