Generic Elements in The Exorcist

How Do Generic Elements encourage the audience to anticipate events in the attic scene in The Exorcist?

1. Set at night time.
2. Dark.
3. Isolated victim.
4. Young-ish female, attractive victim, mother.
5. Vulnerably dressed.
6. Lights don't work, lights a candle, shows shadows.
7. Unidentified noises.
8. Cluttered attic, looks like a confined space.
9. The entrance to the attic is black.
10. No music is played as audience listens to unknown noises too.
11. Tension drops when handyman enters attic, he brings light / sound /  company.
12. Bar shadows suggest trapped indoors.