Not his best... but certainly a classic! Lots of future stars were in that film:
Penn (Oscar winner twice)
Jennifer Jason Leigh
Phoebe Cates
Judge Reinhold
Forest Whitaker (Oscar winner)
You forgot Cameron Crowe who wrote and directed the movie.
Crowe graduated from University at age 15 and started to write for Rolling Stone at age 16. The movie Almost Famous is based on his early life.
At 22, he came up with the idea to pose undercover as a high-school student and write about his experiences. Simon & Schuster gave him a contract and he enrolled as Dave Cameron at Clairemont High School in San Diego.
He also directed Jerry Maguire and Vanilla Sky.