Visible crew/equipment: When the boys are leaving the home in the beginning you can see a boom mic moving over the hood of the car.
Revealing mistake: When Joan Hart is knocked down by the truck she is replaced by an obvious dummy, it is more obvious when the dummy hits the ground.
Factual error: When the shipping container is opened none of the items are secured so they would've been broken during shipping, making it impossible to view the wall anyway.
Revealing mistake: In the shot where the man in the elevator gets bisected by the falling cable, his waist splits apart just before the cable makes contact.
Answer: Having lived as a "normal" boy, Damien is initially shocked to learn his true identity. After having time to adjust and being surrounded and groomed by satanic supporters, he eventually embraces his true persona.
raywest ★
The answer is correct, and I'm just going a into a bit more detail. During the events of the first film, Damien is normal until Mrs Baylock entered his life. She started teaching him about who he was, but he was only five or six, which would have been far too young for him to understand. He started acting more malicious after this point. After the movie ended, it skips ahead to Damien living with his uncle, aunt, and cousin. During that time, it's conceivable that the forces surrounding him decided to give him a period of peace. He was raised by his aunt (secretly a Satanist), but she might have been instructed to give him a normal upbringing so he wouldn't call attention to himself. As a result, he probably forgot about it, and started to believe he wasn't any different. Once he learned of his unholy lineage he began to remember and eventually embrace it, especially since he had several followers (Buher, Neff, and many others he may not have met yet) to help and protect him.
dewinela