Other mistake: Pay close attention to the taxi cab at the end of each show when it drives away the contestant who was just fired. Look at the taxi number on the passenger side door when it is first opened. You then see the number change after the taxi drives away.
Other mistake: Dave injured his left wrist and it was placed in a black cast. Dave wears his watch on his right wrist and has the pen in his right hand as he is right handed. He is shown taking an order right handed, but in a closeup, the shot is reversed, showing him writing left handed and the cast on his right wrist. (00:25:46)
Other mistake: The Zeds infect others through directly touching them. This rule extends to touching their clothes and backpacks, which makes no sense.