Continuity: When Constantine has a sip from his cough medicine, we see the Vermin Man approaching him in the background. A few shots later we see the Vermin Man is still approaching him but he is still moving in the same spot as earlier.

Continuity: When the demon climbs out of the possessed and gets stuck in the mirror we see the reflection of the girl in the mirror and she is smiling with her eyes closed. When it cuts to a close-up of her she is smiling with her eyes open. It cuts again and we see in the mirror she is smiling with her eyes shut.

Continuity: When the Mexican is reaching down the hole for The Spear of Destiny we can see him turning his head to the side. When it cuts he is looking down the hole. Also when he reach his hand down his arm goes between a broken plank and the edge of the hole. When it cuts his arm has moved over the broken plank.

Continuity: Near the end when Constantine is on the floor with Gabriel on top of him. There is a shot from the side rotated by 90 degrees so they appear to be upright. There are several things on both Gabriel wrists which look like hospital ID tags. One of them on her left side has slipped down her wrist on to her hand. The shot switches to looking over Gabriel's shoulder and the tag is now back on her wrist and the writing has rotated. Switch back to a side shot and it's back to the original position.

Deliberate "mistake": When Constantine and Angel are walking to her car the power shuts down turning off all the lights in the street. Then it cuts to inside her car where you can see the lights inside the car is on. When it cuts to outside the car the lights are off.