Continuity mistake: When Dr. Seward first goes to see Renfield, he gets bitten on the right side of his neck, but then grabs the left side as if in pain.
Continuity mistake: When Van Helsing is drawing blood from Lucy Westenra, she alternates from having one breast exposed to being covered up from one cut to the next.
Revealing mistake: In one of the first scenes, Winona Ryder (as Vlad the Impaler's wife), is lying on the floor, dead. Gary Oldman's Vlad falls to his knees, heartbroken, right next to the "dead" Winona, who flinches.
Continuity mistake: At Lucy's dinner party, we see Jack Seward pick his hat up off the sofa so Quincy Morris does not sit on it. Once Quincy sits down, he gets a funny look on his face and then magically pulls Seward's crumpled hat out from under his butt.
Factual error: When Mina is with Dracula within Dr. Seward's room, she is wearing a white nightgown through which, at times, you can see her tiny underwear (more visible when he confesses to be Dracula and she is upset about him having killed Lucy - turning her into a vampire), in a fashion that would not be likely to be worn by women in the late 19th century.
Continuity mistake: On the carriage ride to Dracula's Castle, Jonathan looks out the window and sees the wheels of the carriage. In the next shot, the wheels are covered by a sheet of fabric.
Audio problem: 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 Helsing and his jaw is still moving even though he has stopped speaking.
Continuity mistake: When Dracula sees Mina's picture in his castle, her face is turned to one side; when we see the picture again in the train scene, later in the film, the photo is reversed and her face is turned to the opposite side.
Revealing mistake: When they are in the crypt to kill Lucy, they open the stone lid and look down. Clearly you can see glass on top of the inner coffin, yet later when Lucy goes in the coffin there is no glass.
Continuity mistake: When Dracula stabs the cross and blood pours out of it, in one shot it is slowly creeping towards Mina's dead body and in another shot it is rushing past her and in the next shot it's slowly creeping again.
Continuity mistake: When the wolf scares Mina in the movie theatre, her hat switches back and forth from being forward on her head, to being tilted back. It does this in about 5 shots.
Audio problem: When Dracula and Mina first meet on the street they begin to speak. Dracula's voice has not been dubbed during the first sentence or two. Then in mid stream his voice changes from a high pitched regular rehearsal voice to the heavily accented Romanian voice used throughout the rest of the picture.
Continuity mistake: In the last scene, when Mina Harker lays Dracula's body in the cathedral's altar, she kisses the vampire's lips and he turns into his human self. His face is covered with blood down from his nose, but after the kiss Mina's lips have no sign of blood.
Visible crew/equipment: After the hairy beast Dracula attacks Sadie Frost, Winona Ryder comes to get Sadie in the garden maze. While they're walking back, you can see the camera's shadow on Winona's back.
Revealing mistake: In the chase scene near the end, when Dracula is hiding inside an earth-filled coffin in the gypsy carriage, you can clearly see the tip of one of his rubber-made finger extensions bending.
Continuity mistake: When Van Helsing breaks the news to Quincey after reading the "Vampyr" book, as he says, "Yes, we may still save her precious soul", he's gripping Quincey's coat, and Quincey's left arm is down, but in the previous shot, Van Helsing's arms were down by his side, and Quincey was holding onto the hat on his head. His other arm changes position as well.
Visible crew/equipment: In the scene where Lucy is done in by Dracula in wolf form, as she dies, blood is exploded into the room by "supernatural" forces. If you look in the torrent of blood, you will see the gas, I assume carbon dioxide, from the special effect cannon appear and evaporate.