Curve

Back in 2007 when the project was greenlit, Eva Mendes was set to star as the leading role of Mallory, now played by Julianne Hough.

At the beginning of the movie, the head-unit she's using in the Bronco to play the music CD is a Pioneer. After the crash, the stereo is replaced with a Sony.

In footage reedited into a short "alternate storyline" on the home video releases, Mallory does not give Christian a ride after he restarts her car, and after leaving him behind, calls her sister to talk about the encounter. The car soon shuts down again, and this time upon inspection, she learns a crucial cable has been cut. Unable to get cel service, she happens upon the cabin that appears at the end of the movie in the final cut, and sneaks inside when nobody answers the door. She discovers the phone has been cut, and hides when Christian, who has repaired her truck to use it for himself, arrives at the cabin and enters. The family that is later shown to be victims in the climax of the final cut emerge shortly after his arrival, and it is revealed Christian has been doing contracting work for them. He then commits the murders that are shown after the fact in the climax, and amidst the chaos, Mallory escapes, and in the chase Christian engages in with her, the crash occurs that sets into motion the remainder of the existing film. This is likely an original conception of the story that was changed during shooting to make the murdered family a bigger surprise later on.