Revealing mistakes: When Sebastian misses his mark and falls to the ground, he can be clearly seen landing on a cushioned surface.
Factual errors: Brad needs a blood transfusion and has "rare" blood (AB negative). While AB is commonly misunderstood to cause grave problems because of its rarity, AB is the "universal receiver", and in fact Brad could receive any blood (A, B, AB, or O), so long as the RH factor was negative. A much greater problem would be if Brad had O-negative, because he could receive only O-negative - making it more "rare" in a practical sense. (O is like "zero." It cannot receive any of the A-B factors.)