Continuity mistake: When Constantine manages to get the mirror through the window he falls on his back. To the right on the screen a chair lies on the floor beside a dresser. A few shots later when it cuts to Constantine getting up we can see the chair has changed position as its back now covers the opening of the dresser. (00:08:15)
Continuity mistake: In the pool when Constantine grabs the possessed Angela, he grabs her by her head with both hands. When it cuts he's holding onto her shoulders. (01:26:40)
Continuity mistake: In the scene where John commits suicide by slitting his wrist, the soles of his shoes go from brand new and unmarked (quite clearly seen in a couple of close up shots) to scuffed and worn (also seen quite well in a couple of shots). (01:34:25)
Continuity mistake: There is a close up shot, when John slits his wrist, of the blood seeping around his watch. It is an integral part of the scene, yet moments later, when viewed from above, the blood is nowhere near the watch.
Continuity mistake: When Chas is in his car talking to his mirror you see him holding his right hand on the steering wheel. When Constantine calls for him it cuts and you see Chas resting his arm on the seat beside him instead. (00:06:40)
Continuity mistake: When Constantine gives Angela Isabel's name tag, Angela is holding the tag so that half the tag is between her fingers and the rest of the half inside her hand. When it cuts half the tag is still between her fingers but the rest of the half is now outside her fist. (00:44:30)
Continuity mistake: When Constantine gets thrown into the glass paned door at the end just before he slashes his wrists, every time it cuts to the scene showing the door the broken glass left in the door is always in a different pattern. (01:32:55)
Continuity mistake: When Father Hennessy stabs himself with the cork opener the items around him change position between the shots. (00:47:55)
Continuity mistake: When Angela visits Constantine you can see an ash tray and two bottles along with other stuff on Constantine's table. Later, when the demons fly outside Constantine's window, as the camera moves over the table you can see all items has suddenly been removed from the table. (00:34:40 - 00:36:10)
Continuity mistake: After Constantine has thrown the holy water at Baltazar you can see Baltazar stretching out both hands to grab Constantine. When it cuts, Baltazar grabs Constantine by his throat with only one hand . (01:09:55)
Continuity mistake: When Constantine is seeing the doctor about his cancer you can see the lights on the screen showing the X-rays are on. When it cuts after she says "This is aggressive", the lights are suddenly off. (00:14:15)
Continuity mistake: When Constantine and Chas comes to Midnite's bar and the bouncer holds up the card, we see him holding the card between his thumb, index finger and middle finger. When it cuts, he holds it between his thumb and index finger only. (00:28:30)
Chosen answer: According to the legend of "The Spear", it is indestructible.
Nick Bylsma