Ellie's hair regularly changes shades of brown and from straightened to unstraightened and back and forth within the same scenes.
At 11:56 when Ellie walks past the camera. You can visibly see the camera shake around when the shot was cut.
The road sign listing Seattle, Tacoma, and Portland makes it clear they're approaching Seattle from the north, but then they enter the city from the south, with the Space Needle on the far side of the city and the water on the left. This may have been an intentional mistake by the filmmakers since a similar error exists in the video game it was based on.