Revealing mistake: When Chas is being thrown up and down between the ceiling and the floor, if you look closely as Chas is falling from the ceiling to the floor and goes up again, when he goes up it's just a rewind of him falling down. (01:28:35)
Revealing mistake: What are the odds for twins to have birth marks on the exact same places? When Isabel commits suicide and lands in to the pool you can see she has the exact same birth marks as Angela to the right above her lips and on her left neck. (00:13:30)
Revealing mistake: When it's raining a lot and John is taking a cough suppressant, he sees some kind of bird fly by and looks up. There's a shot of his face from above and the rain is falling around him but not on his face. (00:26:40)
Answer: He calls it hypocritical bullshit because half breeds exist in both half-demon and half-angel form, they "whisper thoughts" to us that are both positive and negative suggesting that we will do both positive and negative things, confusing us humans. They call it a balance because there are an equal amount of both good and bad half breeds. However he thinks this is unjust, because they should let us make decisions on our own.