Kramer was booted from Newman's freezer, forcing him to move his blood, yet in the car his blood isn't frozen.
The sausages in Jerry's apartment were already smoked. Smoking takes days, sometimes even weeks.
Blood banks don't work like financial banks. You donate your blood to them, you don't store your own blood there.
When the blood bank is seen for the first time in the episode, it's clearly in the city. Yet when Kramer (Michael Richards) is driving his blood from his apartment to the bank, he is seen driving down a highway that is not in the city.