Artist Nick Cave was considered for the bad guy/Patrick Nanning role. Cave, who was touring the US at the time, did audition for the role, but later said he was glad he had not been awarded the part.
Brian Libby, portraying the Bum Detective states "Only a psycho *bleep* killer is smart enough to stay out of the rain." The actor himself portrayed a psychotic killer in the 1982 thriller Silent Rage.
Many times throughout the movie, Logan gets his weapon knocked out of reach, but then is then holding it moments later when there was no time to retrieve it.