Continuity mistake: When Mina receives the letter after Jonathan escapes, she's holding it in her hands as she begins to climb the stairs, but in the next shot, her hands are empty, best seen when Van Helsing holds her hands. (01:10:00)
Suggested correction: Mina is in two different sets. The first she is in front of a gate. Of course, she has plenty of time to put the letters away.
I have checked the scene and you are absolutely right - Mina is indeed standing at the gate in the first shot, which gives her enough time to put the letters away before walking up the stairs to see Lucy in the second shot. Sorry, my bad.
Continuity mistake: When Prince Vlad enters the chapel to find Elisabeta dead, as the camera pans toward her, the floor in front of the baptismal font is clean, but in the high angle shot where Vlad cries out and tilts the basin, two small pools of Elisabeta's blood can be seen on the floor (the same blood that is washed across the floor by the holy water in the following close-up of the font hitting the floor). (00:03:10 - 00:04:10)
Suggested correction: Elisabeta drowned; the only blood we see is by her mouth. The red patch on the floor is just a shadow - this becomes apparent when it follows the priest as he moves.
No, the mistake is correct, you are confusing the blood stains by the baptismal font (sitting at her feet) with the shadow above her head: As Vlad enters the chapel, the camera slowly pans toward Elisabeta and the floor in front of the font is clean. In the high angle shot where Vlad cries out and gets up, we see two small pools of Elisabeta's blood in front of the font. In the following close-up of the font falling, we see a pool of blood at the bottom of the shot which is then washed across the floor by the holy water.
Trivia: The film earned over $215 million at the box office, making it the most successful adaptation Dracula adaptation in history.