Chrome BMW:
Enter the online multi-player car showroom. Highlight the BMW Concept 1 Series car and press L2, R2, L2, R2.

Fully upgraded Ford Bronco:
Enter the online multi-player car showroom. Highlight the Ford Bronco and press L2, R2, L2, R2.

Purple sub lights:
Destroy ten street lamps and five benches consecutively.