Continuity mistake: Jack sees the car drive into the creek and runs to check for anyone injured. Jack dives into the water and you see the car submerge completely. Jack is then looking around and the car's trunk is sticking out of the water, then submerges yet again.
Continuity mistake: Jack is sitting inside the hotel room with his head against the window. The scene cuts to the inside of the room and now there is a blue curtain that is in between Jacks head and the window.