When Dexter rolls the car near the end, after one complete roll, the car has clearly finished rolling, even bouncing slightly back the other way. Then from the next angle it continues rolling another half, onto the top.
While Dexter and Debra are in the briefing room talking, Deb says "I know what it's like to be taken" (referring to Dexter's brother who took her, The Ice Truck Killer) and immediately after Dexter has one his asides and says "she can't even say his name, Rudy, my brother" when in fact it was revealed that his name was Brian Moser, not Rudy. - While Dexter's brother's name is in fact Brian (Moser), he and everybody else mostly knew him as Rudy Cooper. So that name would be first on their minds.
(at around 46 mins) While she was held up inside the boot of his car, Jordan hits Lumen with the barrel of his gun and she began bleeding from her forehead. There was a definite scar from the injury when she and Dexter were dumping Chase's body into the water. However, the scar had vanished the very next day when she announced to him her decision to leave.