Who's your favorite Antichrist? (In book or film.)

IIRC he could control the look of his eyes for a limited time so that they looked normal. The book was very bad.

Oh, and to nitpick:

We never see the child in the movie so we don’t know if there are any other unusual physical features.

Of course, but since part of the atmosphere of The Omen is created by Biblical scholarship and rummaging around in old texts, I think it might have made a slightly better movie if Damien’s birthmark had been in the shape of the Greek (digamma kappa kappa) or Roman (DCLXVI) numerals for “666”. More authentic, you know?