Continuity mistake: The Audi car is missing its W12 logo in the grill in one shot. In different scenes with the Audi, there are two different number plates at the front (at least where the number plate were supposed to be: one with two "holes" at the lower end, and one without. Obvious that there were 2 different cars used.
Trivia: The scene where the drunkard sees the car go above him and thinks it's just his imagination is a homage to the Bond movies "The Spy Who Loved Me", in which a character has the same reaction when the car drives out of the water, and "For Your Eyes Only", in which that same character has the same reaction when Bond skis overhead.
Question: Why was Frank evading the police after managing to escape the bad guys? Couldn't Audrey tell them that he was on their side?