Director Richard Rush clashed with producer/financier Andrew Vajna over the final cut of the film. Rush wanted his longer, eccentric, cut to be released, but Vajna wanted the shorter, and more conventional, 121 minute version released. Vajna eventually got his way.
In the scene when Dr Bill Capa (Bruce Willis) returns home from jogging, then opens his mailbox and a rattlesnake pops out, causing him to fall onto his back in fright, then he grabs a shovel from a gardener's truck and uses it to hit the mailbox causing the rattlesnake to jump out and slither off into a field, a similar scene happens later in the film. This is when Bill is being chased in his car by the menacing driver in the red car with the black windows. A gardener's truck gets crashed into on the freeway and some tools fall out of it. In both scenes Bill was in danger.
The trivia item below may give away important plot points.
In the final showdown which takes place in the warehouse, when Dr Bill Capa (Bruce Willis) sees for himself - after paying an unwelcome second visit to Edith Niedelmeyer (Shirley Knight), when she revealed a breakthrough - that Rose (Jane March) had been disguised as his patient Richie in therapy sessions - as well as Bonnie, not in the group - and so Bill removed the Richie disguise to reveal Rose. Then Dale Dexter (Andrew Lowery), also Rose's brother discovered them and turned nasty with his nail gun against Lt Hector Martinez (Rubén Blades) when he tried apprehending Dale and got distracted. Dale then trapped Bill in a cage, was nearly ready to kill him and got killed by a shot nail by Rose. She was devastated at killing her brother, tried to kill herself - the nail gun fortunately stopped working - and then climbed up the warehouse tower ladder into a fierce rainstorm. Bill went up after her fast and as they were prancing around on the flat roof, impressive shots of LA, mainly of car headlights could be seen. Bill manages to save Rose from falling to her death, the tower lights glow red and his colourblindness has gone.