Paul Schrader told HX magazine that Woody Harrelson refused to do any publicity for this movie because he was dissatisfied with his own performance in it.
Even though this is never resolved in the movie, in an interview with moviesonline.ca, writer and director Paul Schrader said that the only reason the murder victim was stabbed in the crotch (in addition to his fatal wounds) was "misdirection."
No. Paul Schrader said in his Q & A session about this film at The Chicago International Film Festival that he envisioned "The Walker" more as a follow-up to "American Gigolo" in which we would see the character of Julian as a more refined 50 something. Therefore, in Schrader's opinion, "The Walker" is closer to a sequel than a remake of "American Gigolo".