The quote carved on the vault's door, "That is not dead which can eternal lie, and with strange eons even death may die", is from H.P. Lovecraft's short story "The Call of Cthulhu" and "The Nameless City". It is supposedly a couplet by Abdul Alhazarred, fictional author of the Necronomicon.
During the discussion when they're asking Tina what went on while she was in the tunnels, there are several shots where you clearly see that Tina's right hand covered in blood. When they cut the same hand to see if she's infected, however, the close up of her hand shows it's slightly dirty but without a trace of blood.
When Jonathan, Liz, Jamie and Tina crawl up the ladder from the tomb through the tunnel through to the house, Tina is first on the ladder. Yet when they emerge into the house, she is second to last to come out.
When the Doyle's arrive at the Mortuary, it's daylight. Within a few moments, Jonathan Doyle is in Bobby Fowler's old room looking outside to the graveyard and it's pitch black.