None.

The heffalump is hit in the bottom with his lunchbox, which he mistakes for someone hitting him.

Characters are seen falling over a few times.

None.

Roo mentions that you could be given cider while trick or treating.

A tombstone is seen.

Dark lighting.

Trees with spooky faces.

A very unrealistic drawing of a skull and crossbones.

Bats.

Lightning.

Paper skeleton decoration.

Spooky shadows.