Tom Cruise said that he was on his mobile phone trying to buy the remake rights during the end credits the first time he saw the film.
Penélope Cruz also stars in Vanilla Sky (2001), Cameron Crowe's remake of this film, playing the same character, Sofia.
When César (Eduardo Noriega) goes to Sofia (Penélope Cruz)'s apartment and starts to rip down her photos on the wall, there is a picture of "The Sandman," a popular comic book that deals with the world of dreams, created by Neil Gaiman.
The song playing at the nightclub when César first arrives is "Rising Son" by Massive Attack, in which the phrase "dream on" is frequently repeated.
Alejandro Amenábar: with other two people in the bathroom of the disco, when César goes there. He is the last one that gets out.
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