I read everywhere that trevor hit and run over the kid and its guilt ate him up,but is it possible that he didn't hit and run but he was hit when he was a kid,and probably went in coma after that and imagined everything up?
I am saying this because there are a lot of references of the imagined waitress being exactly like her mother,and he was alone on that route 666 with the little kid,kinda like when the kid got hit by the car.
PS: Sorry english isn't my first language but i hate ai so i wont be using it to polish my language.