Quinn tells Rembrandt there's five hours remaining on the timer. Later, Quinn holds up the timer and it looks like there's 46 hours on the countdown.
While Quinn and Van Elsinger are 'freeing' vampires in the coffin area, a stray vampire surprises them and jumps Elsinger from behind. In the ensuing struggle you can see burn makeup on the side of the vampires face that was meant to 'appear' when Quinn placed the crucifix on the vampires face.
When Rembrandt is flung backwards by the guitar, wires are visibly attached to his shirt.
when Quin, Rembrandt and Maggie go in the museum, the first vampire comes down upside down to attack. after Maggie shoots him, you can see a wire just after he falls.