Firstly the dreamworks title clitches like a video tape would, which then links in later with video tape references in the title sequence.
The girls are young, which is similar to the target audience of around 15-25 year olds. It is certificated a 15 so we ax see it is for people of the age group being shown.
The lighting is dark which fits with the rain sound and this allows the audience to instantly determind genre as horror.
Close ups of the face are shown making the audience feel as if they were there with the characters, engaging them even further.
The television turns on by its self, which then makes the audience remember the dreamworks title. It also scares the audience letting them know exactly what genre it is.
The liquid on the floor could be blood, the audience then want to know where it is coming from and as the close up below shows, they want to know what is behind the door.
The girls face scares the audience engaging them as it is a long opening sequence.