The glass lid on Lucy's coffin disappears midway through the scene. When the men look into the coffin, the lid is present, but when Lucy walks over to the coffin, she gets in without having to open the lid.
The vampire woman tears open Jonathan's shirt but it's previously shown to be already unbuttoned.
After Harker's escape from the castle, the nuns send a letter to Mina. She holds the letters in her hands as she approaches the stairs to Lucy's balcony. When she's climbing the stairs she no longer has them in her hands.
After Van Helsing inspects Mina's teeth on the train to Transylvania, Jonathan leans toward her and he is sweating hard. When we next see his face, moments later, there is no sign of sweat.
The first time we see the Count's carriage, the wheels are covered, but when Jonathan looks down past the wheels to look down the side of the cliff, they are "open".
Varna was/is a Bulgarian port, not a Romanian port.
In the opening scene, it says that Constantinople was captured by the Turks in year 1462. In actuality, it was captured by the Turks on May 29, 1453.
When Harker cuts himself shaving, it should take a second or so for blood to appear, and the razor would have very little, if any, blood on it, certainly not the large amount smeared on the blade that Dracula licks off.
In the first garden scene with Mina and Jonathan, which takes place in early May, a purple wisteria vine covered in flowers is growing over Lucy's bedroom doors. However, in a later scene set in August or September, in which Mina runs up the garden steps to Lucy's bedroom, the wisteria vine is shown to still be in full bloom. Wisterias only bloom for about three weeks in late spring, so this vine shouldn't have any flowers on it in August or September.
During the storm sequence, both the voyage of the "Demeter" and a full moon are shown. According to the captain's log, the "Demeter" departs on June 27, 1897. A newspaper headline shown in the film reporting the ship's arrival in London is dated July 7, 1897.
There was not a single full moon between June 27 and July 7, 1897.
The last full moon was on June 14 (just under 2 weeks before departure), and the next full moon was on July 14 (about a week after the ship's arrival).
When Mina and Vlad are at the cinematograph, the films being shown are moving very smoothly, without the jerky movement typical of early silent films. However, although many of the early silent films did have jerky movements because they were filmed at a lower frame rate than what is used today, this does not apply to every film of that era. The earliest silent films actually had a variety of frame rates, between 14 and 26 frames per second (24 frames per second is today's standard). One example of an early silent film without jerky movements is the 1896 short film The Kiss.
After Jonathan's hair turns gray, throughout the rest of the film, it goes back to being dark again, with very little gray, and switches back to gray. However, this is an effect of Jonathan having been subjected to predation by vampires under Dracula's aura, so it's not a surprise if his hair color changes at the same rate of Dracula's shape and power.
Lucy's red gown seems to be two different lengths when she walks through the garden maze at night: At first, the gown reaches her feet, but after her skirt is blown up in the wind, it looks like it's knee-length. However, the skirt continues to sink back down and at the end of the shot you can tell that the dress is still reaching her feet.
In the transfusion scene, Van Helsing spoke of "Landsteiner's method". Although Landsteiner did not publish until 1897, it is quite possible that Van Helsing may be acquainted with both him and his technique.
Lucy seemingly had to open her coffin and crypt to snatch the little girl, but everything is completely sealed, and the men had to pry the crypt open as if it was being unsealed for the first time. However, as stated by Van Helsing earlier in the film, vampires can appear as mist, vapor and fog, making it perfectly possible for Lucy to escape the tomb without having to open anything. This is in keeping with the book, which implies that Lucy can slip between the space of a tiny crack: "We all looked on with horrified amazement as we saw, when he stood back, the woman, with a corporeal body as real at that moment as our own, pass through the interstice where scarce a knife blade could have gone."
Elisabeta's eyebrows and eyelids twitch visibly when Prince Vlad stumbles down to view her dead body.
In the opening scene, when Dracula kneels down next to the body of Elisabeta, you can clearly see Winona Ryder's face twitching.
When Lord Arthur Holmwood is sitting at watch beside Lucy's bed, the cable that hoists Holmwood up is visible as Dracula's werewolf-like persona bursts through the glass into the room.
When Dracula flies into the room during the vampire orgy, you can see the moving platform that is carrying him.
When Arthur is guarding the sleeping Lucy and she wakes up gasping, he looks up and sees Dracula at the window. You can hear a woman's voice off-screen giving Cary Elwes his cue to look up (she says 'Now!'). This may have been fixed on the DVD version but was certainly audible on the VHS.
The ticker tape has a mis-spelled word as "At Once, Do Not Loose an Hour", most likely should be "Do Not LOSE an Hour" referring to a call for Helsing to visit.
In the beginning of the film when Dracula returns to find his wife dead and begins to fly into a rage renouncing God, the priest (Anthony Hopkins) makes the sign of the cross the wrong way. He touches his right should then the left but it should be the opposite way.
Harker recognizing the younger version of Dracula immediately on arrival in London beggars belief-he looks completely different, as well as years younger.
The language spoken in the beginning is not medieval Romanian - it is modern Romanian imitating medieval English syntax.
Fashion in 1897 was very different from what is portrayed in this movie. By 1897, exaggerated bustles had been out of style for some years already-they were more typical in the 1880s.
When we see the ticker tape typing out the message sent to Van Helsing from Dr. Seward, the type appears to be OCR (optical character reader) font which was not created until 1968.
When Dracula bites Mina, her 20th century bikini briefs can be seen beneath her sheer 19th century night gown.
Marie Curie, who is mentioned in a film set in 1897, did not enter science until her first paper was published in July 1898.
When Holmwood has the gun pointed in Van Helsing's face in Lucy's crypt, Van Helsing explains about the undead. Switch to a shot behind Van Helsing and his jaw is still moving even though he has stopped speaking.
When Harker arrives at the castle and Vlad's shadow is seen to
emerge from the left on the hallway wall, the puppeteer manipulating the puppet casting the shadow can be seen near the end of that effect. NOTE: This error seems to have been fixed for the Special Edition DVD, released in 2007.
When Lucy and Mina are in the maze, running in the rain, you can see crew members standing behind Lucy during one of her laughing close-ups.
When Mina and Lucy are running back to the house after the monster attacks Lucy, you can see the shadow of one or two stage lights on Mina's dress.
When Jack Seward is interviewing Renfield in his cell and is
subsequently attacked by him, Renfield bites him on the right side of the neck. When the orderlies run in to restrain Renfield, Seward grabs the left side of his neck as if in pain.
When Lucy shows Mina the illustrations in "Arabian Nights," the art is not Islamic but Indian; specifically, they are in the style of Mogul miniatures.
When Dracula looks at R.M. Renfield's "Royal Society of Solicitors" card, his name is incorrectly written as "R.N. Reinfeild."
Professor Van Helsing's accent makes him sound more like a German than a Hollander.
When Van Helsing crosses himself in the confrontation with Dracula (at approximately 1h45m), he does it in the Eastern Orthodox fashion (right shoulder first). If he is Swiss, he would do it in the Roman Catholic fashion (left shoulder first).