The brand of car driven by Marshal was switched between Buick and Pontiac thorough the film.
This is a massive plot hole. When Todd was relaying to Randy that Marshall never existed & that it was all in his dream. But, the viewers did see Marshall introducing Randy to his mother, the viewers did see that Randy's father, Randy's mother & the Pastor were introduced to Marshall & that Marshall was there when Randy's sister was returned to her family & that it was also shown at the denouement of the film that it was Marshall that was driving the car that had picked up Randy, his sister, & also Efrem as well.