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Continuity mistake: Sitting in front of the fireplace at her party, Chris asks Father Dyer, "Who's the priest I keep seeing there…" and the woman to his left has a drink in her hand. In the next shot the drink is on the table. (00:40:20)

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Continuity mistake: Sitting in front of the fireplace at her party, Father Dyer tells Chris that Father Karras' mother had died the previous night. The candle in the candleholder to her right rotates throughout the scene. (00:40:35)

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Visible crew/equipment: Watching the alien spaceship that lands outside the Belmont lab they all get out of the car and Carol says, "I'll get them from Russ". If you look closely as she opens her door, the reflection of the crew can be seen in the passenger side vent window. (00:52:35)

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Continuity mistake: Before Dr. Marvin removes the helmet from the dead alien, Maj. Huglin is holding his rifle in his right hand. In the next shot he's using his right hand to remove the helmet. Then in the shot after that he's not touching the helmet at all. (00:56:15)

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Deliberate mistake: As the alien ship attacks and destroys the bomber with it's ray gun we see stock footage of a different WWII bomber being destroyed by the German Air Force. (00:57:15)

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Continuity mistake: Chris takes Regan to Doctor Klein for some tests to see what's wrong with her. As she sits in the office waiting for the doctor to come in, the papers on his desk move between shots without anyone going near them. (00:34:10)

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Continuity mistake: As Chris sits in the office waiting for Doctor Klein to come in, the tissue coming out of the Kleenex box behind his desk moves between shots without anyone going near it. (00:34:15)

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Deliberate mistake: After the alien ship destroys the bomber, Dr. Marvin picks up the helmet and they all start to run back to the car. In order to save time in repositioning the camera they start out 50 feet behind where they just were in the previous sequence and run back to the exact same spot. (00:57:50)

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Continuity mistake: As Damien walks into the psychiatric ward to visit his mother the woman directly across from her changes sides on her bed between shots. (00:38:15)

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Visible crew/equipment: In his office as Chris talks to Doctor Klein the boom mike's reflection can be seen moving around in the metal light behind him. (00:34:45)

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Continuity mistake: We see the alien ship before it destroys the Pacific Paint Company with what looks like a beautiful cloud filled sunset behind it. In the next shot as the building blows up the sky is cloudless. (00:57:30)

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Continuity mistake: After listening to the alien translating device from the helmet the general says, "I'll show you how it works" and Maj. Huglin turns to look at Carol twice between shots. (01:00:40)

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Deliberate mistake: As the alien spaceship attacks a bomber we see it superimposed through the windshield. The pilots never react because they're not actually seeing it and are poorly directed. (00:57:10)

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Continuity mistake: In Doctor Klein's office the handle on the ice bucket in the back of the room under the blue picture is moved as the scene progresses and Chris talks to the doctor. (00:33:45 - 00:35:55)

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Visible crew/equipment: After Maj. Huglin shoots and kills the alien the shadow of a crew member can be seen moving on the right of the screen. (00:55:50)

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Visible crew/equipment: When seen up close the aliens helmets have no openings. When the alien spaceship takes off outside the Belmont lab one of them is left inside. As he walks out the reflection of the window on the front of his helmet and the person in side can be seen in the sunlight. (00:54:20)

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Continuity mistake: As Prof. Kanter is incinerated by the alien's beam we can see the shadows cast by the leaves of the trees move before our eyes between shots. (00:55:00)

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Continuity mistake: After the general says, "I'll show you how it works" they all turn and follow him. In the next shot they're in an entirely different room. (01:00:55)

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Continuity mistake: The alien helmet that we see on the desk as the generals introduce themselves to Carol and Dr. Marvin is not the same one we saw earlier. This one has a large lip on the bottom and the one that he removed from the dead alien did not. (00:56:20 - 00:59:35)

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Continuity mistake: We see the head of the alien up close twice and each time the gravel underneath is raked differently. (00:56:25)

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