During the test drive to the hospital, Max's jacket alternates between a light coloured one and a dark brown coloured one.
When Max and 99 make their high speed test drive to the hospital, in at least two of the shots the image has been reversed. In one shot you can see that the driver is on the wrong side, but it is most easily spotted by looking at the hood bulge that covers the Opel GT's air cleaner. The bulge is on the passenger side of the hood, but in some shots the bulge is on the wrong side of the car.
Max , the Chief, and 99 are communicating via a pay phone. Max has a shoe phone that he has used for five seasons and would not need to be tied to a pay phone.