The list of Gaspar Noé's other participations isn't complete, as he probably got thanked in many other films without us knowing. He's also part of some movie documentaries in which he has been interviewed.
Gaspar Noé was also an assistant director in some commercials directed by Bruno Podalydès between 1985-1990.
He would have directed a shortfilm entitled Fleurs (Flowers) in 1990 but we remain unable to find more informations about it.
Gaspar Noé also make some appearances in his own films :
Love (2015) - Credited as Aron Pages, as the gallery owner
Enter the Void (2010) - As a client before Oscar is being killed, and later during a subliminal frame as Cyril Roy's character, in a nightmare scene
Irréversible (2002) - A client in the Rectum
Tintarella di Luna (1984) - A young villager