Continuity mistake: In one scene when Hudson and Andrews enter the vestibule of her house, Rock can clearly be seen to have "mutton chop" sideburns. However, once inside the house, they're gone. When he goes back outside, they're back.
Visible crew/equipment: In the final scene (shot outside), one can clearly see the boom mic enter the top of the frame when Cassavetes's character is talking.
Continuity mistake: When the couple from Ohio is in the back of the squad car, the cop says that there is a hold up at a liquor store. When they get there, the store is clearly closed.
Continuity mistake: When Paris is offering all the other prisoners half of his hidden money for a way to escape, he lays down in his bed with his cigar in his mouth and his arms at his side. The camera angle changes to a wide shot of the holding cell and the cigar is now in his right hand near the edge of the bed.
Revealing mistake: That isn't Joan Sims in the shower as seen from above. The stand-in doesn't remotely resemble her.
Continuity mistake: The third time we see the stagecoach on its way to Denver, it's passing the exact same tree and hill that it passed at the start of its journey. It's also traveling on a paved road, which in 1860s frontier Colorado is extremely unlikely. (00:11:15)
Revealing mistake: When Brewster is flying around in the Astro-Dome at the end of the movie, in a close up you can see the cables attached to him for a good second or so.
Continuity mistake: The footage of Dracula impaled on a giant golden crucifix at the end of 'Dracula Has Risen From The Grave' is re-cut for the pre-credit sequence of this film. However, when the second film continues, the golden crucifix is missing in the background, behind Dracula's powdered blood and collapsing cloak, creating a continuity error with perhaps an unusual reason for happening. Hammer props department may have rid themselves of the crucifix between films shot a year apart.
Continuity mistake: When Tawes goes upstairs into the room where Alma is sitting on the bed, they hug then sit on the bed, and kiss. As they kiss, Tawes places his hand on her left shoulder. Then when it cuts to a closeup, his hand is missing.
Continuity mistake: When 1st Lt. Milo Minderbinder has the egg in his hand and is explaining the profits that can be made, the egg is suddenly gone as he begins walking away.
Visible crew/equipment: In the scene where Luke has stolen the Jaguar from the old rich guy, there is a part where Luke drives the Jag up the wall of the tunnel and lands it on top of a truck. It is obvious that the car that goes up the wall isn't even real, it looks more like a Matchbox or Hotwheels car....
Continuity mistake: In the scene where Jack Nicholson finds the piano on the back of the moving truck, he uncovers it and tosses the tarp on the side of the truck. Over the next few shots, the tarp disappears and then reappears draped over the side of the truck. As well, the shots of Billy Green Bush taken from outside the vehicle show his hands gesticulating wildly, while the shots from inside the vehicle, from over his right shoulder, show his right hand calmly positioned on the upper right part of the wheel. This scene also contains a magically appearing chair. When Jack first finds the piano, he has to lean over to play, but a few shots later, he is seated comfortably on a straight-backed kitchen chair. (00:19:10)
Continuity mistake: When the Bannister gang begins shooting at the house, the ladies abandon their breakfast to run and hide upstairs. There's a pitcher half full of milk on the table. But a few shots later, when one of the Bannisters bursts into the kitchen, the milk pitcher is empty, and the dishes are in different positions on the table. (01:23:55)
Continuity mistake: Paul enters the castle in Dracula's coach. When he gets out of the coach and walks around a bit, the coach with the horses has suddenly disappeared.
Revealing mistake: A Nineteenth century social occasion is taking place at a mansion in the evening. The lead female vampires servant arrives by horse in front of the mansion and in the background you can see some modern tennis courts with metal gates and fences. The nets have been removed but the appearance of the courts can still be seen. (00:10:35)
Continuity mistake: When Dr. Brockton is descending into the cave her hair changes from one style to another.
Continuity mistake: In the scene at the hockey game where Oliver talks to Jenny while he's in the penalty box, he wears number 7. When the shot cuts to the action on the ice during this conversation, number 7 is in the game sliding on his stomach, and then back in the penalty box talking to Jenny. (00:04:10)
Other mistake: In the opening credits, character actor Andreas Malandrinos has his last name (as it happened not infrequently throughout his career) misspelled as "Melandrinos" (00:02:55)
Factual error: When Clint Eastwood catches an Indian arrow in his left shoulder, he instructs Shirley MacLaine to prime the arrow shaft with gunpowder, which he then ignites as she forces the shaft all the way through his shoulder. Presumably, the burning gunpowder would cauterize the wound all the way through his body, or that's what the filmmakers asked the audience to believe. In reality, gunpowder is historically well-known for causing gangrene in open wounds. With a shoulder full of gunpowder cinders, Clint Eastwood should have died of gangrene and sepsis by the end of the movie.