Though Keanu Reeves character is supposed to be a younger lover of Robin Wright's character, Reeves is actually a little over a year and a half older than Wright.
Winona Ryder, Keanu Reeves, and Monica Belucci previously appeared in Bram Stoker's Dracula (1992).
The film was a production of Plan B Entertainment, the company founded by Brad Pitt and Jennifer Aniston (among others) in 2001. Aniston relinquished any control after her divorce from Pitt. The company is responsible for, among others, "The Departed," "12 Years a Slave," "Blonde," and "She Said."