Continuity mistake: During "There's a Light" Janet's sweater changes colour. First it's white, then blue, then white, then blue, then white. In the car, it's white, once they get out of the car, it's definitely pale blue from all camera angles and gets slightly darker as it gets wetter, then there's a 7 second shot where it's definitely white, then there's another two shots where it's blue, then they reach the door and it's white for the remainder of the time it's in the movie. It's been suggested that there's colored lighting, but nothing else picks up nearly that amount of blue, i.e. her pink shirt isn't lavender, its white buttons aren't blue, their teeth aren't greenish, etc.
Picture added by Daz