In the last Scene, John Ross is drinking from a bottle in the back of a car. The level of drink in the bottle starts small, then the bottle is almost full, then it is almost empty, then half full.
After Christopher's car explodes and Elena pulls herself together, there is a very annoying humming sound that lasts for a total of 6 seconds or so as she gazes at the burning car before she starts to scream his name out. It is unclear if this annoying sound had to do with the explosion itself and the writers/director/producers wanted it that way as it picks up seconds after the car explodes in a new cut of the scene, or is an actual flaw in the sound quality as it sounds like an old TV that's making an annoying humming or squeaking sound because it's very old and in need of replacing/repairing.