In the cold open, when Jimmy first holds out the microphone to Chuck, the hand in which he holds it changes between shots (from his left to his right).
Mike's trick to shake the 'tail' by gumming up the works of the car park barrier can't work because the machine does not pull in a second parking ticket while the barrier is still up. Mike would have needed to get out of his car after exiting the barrier and feed the gum into the machine after it had closed behind his car.