1. The film was based on the non-fiction book Wiseguy by Nicholas Pileggi, which was based on the life of mobster Henry Hill. 2. Robert De Niro and Joe Pesci both received Oscar nominations for their performances in GoodFellas. 3. Martin Scorsese originally wanted to cast Ray Liotta as the lead character, but he was rejected by the studio because he wasn't a big enough star at the time. 4. The film was shot in chronological order, which allowed the actors to develop their characters more naturally over time. 5. The famous "Layla" scene was actually improvised by Joe Pesci and Robert De Niro during filming. 6. The film's soundtrack features classic songs from artists like The Rolling Stones, Cream, and The Ronettes. 7. GoodFellas is considered one of Martin Scorsese's best films and is often cited as one of the greatest films ever made. 8. GoodFellas was nominated for six Academy Awards, including Best Picture and Best Director for Martin Scorsese.