Revealing mistake: When Damian knocks Lee Remick over the balcony with his tricycle, five big goldfish in a bowl get knocked over, too. But the fish don't move; they don't flap around like fish do out of water. They are obviously fake fish.
The Omen (1976)
1 revealing mistake - chronological order
Directed by: Richard Donner
Starring: Gregory Peck, David Warner, Billie Whitelaw, Lee Remick, Harvey Stephens
Factual error: In the cemetery, the skeleton of Gregory Peck's son is far too big to be that of a newborn, which it is supposed to be.
Mrs Baylock: Have no fear, little one... I am here to protect thee.
Trivia: Richard Donner was originally wary of sending the script to Gregory Peck. Combined with the original ending, in which Robert kills Damien, and the fact that Peck's son had recently committed suicide, Donner thought offering the film to him was distasteful. But to Donner's surprise, Peck agreed relatively quickly to do the film.
More questions & answers from The Omen
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Answer: It's possible that the mark didn't appear until Mrs Baylock showed up and began teaching him about his heritage. The mark of the devil is said to appear only when Satan accepts a follower, and up until Mrs Baylock appears, Damien is a normal boy. Yes, he's the devil's son, but he knows nothing of his evil nature until she starts teaching him. In fact, at one point, Robert mentions that he knew every inch of Damien's body since he raised him and never saw anything, so more than likely the mark didn't appear until Damien had areas on his body where it could be hidden more easily.
dewinela
But it's a birthmark. He had it when he was born.