Indoors

Fake blood
Use food colouring to make fake blood

Handprint
Bloody handprints on the wall, the mirror, and so on.

Hand
A close shot of a shaking hand on the floor.

Leg
A close shot of someone’s leg dragging on the ground.

Outdoors

Zombie walking
Wide shot of people walking like a zombie on the ground.

Street
Still shot of a quiet and dark street