- Factual errors: Damien reads aloud from Revelation 13 but what he reads is actually cobbled together from seperate sections of the Bible. In order, they are Revelation 13:4, 19:19, Daniel 8:25 and concluding with Revelation 13:16-18.
- Revealing mistakes: Although much is made of Damien's invulnerability, when he screams after he kills Mark, you can see his fillings.
- Errors in geography: When Thorn and his curator are checking the container that holds the wall, they are supposed to be in New York, but the skyline shot and the railroad (Rock Island) reveal their Chicago location.
- Continuity: The close-up of the crow's eye in Aunt Marion's room is the same shot as the close-up of the crow on the roadway. You can see the reflection of the trees along the roadway in the crows eye even though it is inside Marion's bedroom at night.
- Factual errors: When been grilled by the teacher regarding important dates in history, he reports the date of the Battle of the Nile as being 1789, when in fact it was 1798.
- Continuity: The setting goes from fall to winter (with snow on the ground and a lake frozen over) back to what looks like early fall (leaves on trees just yellowing and the grass still green) several times in what is supposed to be a continuous 9 month period - one school year in the life of the titular character. In one scene, a major character dies in the snow surrounded by leafless trees. This is immediately followed by a scene at his funeral (which could only have been a couple of days later) back in early fall. Later, when Damien's Uncle is in New York City there's a thick blanket of snow on the ground and he is visibly cold, while back in Chicago, on what is supposed to be the same day, the trees are again covered by faintly yellowed leaves and the weather seems mild.
- Plot holes: Richard Thorn retrieves the daggers from Bugenhagen's box at the museum. However, Bugenhagen and his box were buried only a day or two following Robert Thorn's attempted killing of Damien, and the daggers would still have been in London, not in the box.
- Factual errors: When Carl and Michael are at Yigael's Wall, Carl shouts out a biblical quotation which he claims is from the Book of Revelation, but it is actually II Thessalonians 2:8.
- Continuity: When Richard Thorn is in the boxcar or container containing the wall with the supposed picture of the Anti-Christ looking like Damien, Thorn actually looks at a second painting of the Anti-Christ at an older age, shown at the beginning of the film. Thorn never gets a look at the wall painting that looks like Damien.
- Revealing mistakes: When Richard is looking at the image on the wall the face has green eyes. Damien's eyes are dark brown.
- Crew or equipment visible: Reflected on the roof of the limousine (lower left-hand side of the screen) as the boys are leaving home at the beginning of the film.
- Continuity: When Ann reads of one of the deaths,the establishing shot of the newspaper shows the front page of the newspaper with the victim's photo on the left of center. In the very next shot, seen from a distance, she is reading from an interior page with a completely different page layout.
- Continuity: The faces as on Yigael's Wall differ when shown throughout the film. The Antichrist as Child as shown at the beginning of the film is clearly based on Harvey Stephens as Damien in the first film. The next incarnation of the Antichrist is glimpsed briefly and resembles a rough sketch rather than the highly finished portrait as shown later. Also, this Antichrist as Teenager portrait bears almost no resemblance to Jonathan Scott Taylor.
- Revealing mistakes: When the doctor is cut in half by an elevator cable, the body starts to pull apart before the cable hits.
>>> WARNING: Here Be Spoilers <<<
Goofs below here contain information that may give away important plot points. You may not want to read any further if you've not already seen this title.
- Crew or equipment visible: SPOILER: Just before Joan Hart gets her eyes plucked out by the crow, you can see the red light of the camera on the steering wheel.
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