Eriq La Salle (ER's Dr. Benton) and Ving Rhames (Marsellus Wallace of Pulp Fiction) play two of Jacob's fellow veterans, before either of their actors had those roles.
Jason Alexander also has a small role.
When Jacob is running a high fever and freaking out, Kyle Gass helps fill his tub with ice.
What Could Have Been: According to director Adrian Lyne, the original screenplay contained a much more traditional, Bosch-esque depiction of hell. However, Lyne thought audiences would find such imagery silly.