When Jim and Mary are walking up to his house, there is a car parked in the car port of the house next to his, but when Jim gets into his car a few minutes later the car port is empty, revealing that it was shot at a different time.
Jeff limps after Jim runs him over, but when Jeff gets out of the taxi and walks away his limp is gone. But since we never actually see Jeff getting hit the by the car, we can never be sure of the severity of his injury. He could have exaggerated his limp to gain sympathy from Jim. This is also hinted at during the closing credits when Jim says "ever since we got out of the taxi, your limp's been pretty much ... gone", to which Jeff sheepishly replies "well ... it comes and goes".
As Jim and Mary are walking home from the station, the cameraman's shadow is briefly visible (when Jim says he want to do something he is passionate about)
When Jim and Jeff are waiting for the taxi (during the long, awkward pause) the cameraman gets close to Jim's face casting an obvious shadow.
When Jim and Jeff car-jack the car, the cameraman is briefly visible in the car window reflection.
When Jim and Jeff confront the Car Thief at the end, the cameraman's shadow is cast on Jim and Jeff.