The address of the locksmith changes several times throughout the film and refers to locations in Portland, Maine - not Oregon: Jill's initial Google search shows it to be 789 NW Riverton, Portland, OR; the officer reporting it to Detective Hood states that Jill pulled a gun at a "locksmith over in Oakdale"; the police report regarding the incident lists the address as 651 Rivertone. Riveton is a street and Oakdale is a neighborhood in Portland, ME. Neither of them exist in Portland, OR.
When Jill goes to her friend's house they are at the back of the house and it is daylight. Moments later out the front it is dusk and moments later when she's driving it is fully night time.
When Jill's psychiatrist informs police she is downstairs and Sgt. Powers radios for officers to stop the suspect vehicle, how do they know what kind of car she's driving? Jill's car was impounded at the hardware store and she paid the janitor at Jim LaPointe's (the alleged kidnapper/murderer) former hotel to use his car. How could the cops possibly know what kind of car she was in at the time?
When Jill is nervous getting into her sisters car in her driveway, as she looks around a black cat can be seen crossing the road behind her. The camera angle changes slightly and while Jill continues moving to enter the vehicle the cat is frozen in motion since the background is now a still photo.
This is supposedly the Pacific northwest where it rains a lot. It is very unlikely a non reinforced hole just dug into the ground would not have collapsed in the year since Jill had been snatched.
Jill's neighbor tells her that the mysterious van was outside her house at 1:00am, but when she confronts the locksmith she asks him if it was there at 2:30am.