At 36 minutes into the film Jack and Beal are in a restaurant restroom. While they are talking a man enters one of the stalls. A few minutes later a different man leaves the same stall and then a few seconds later another man leaves the same stall.
At about the 47 minute mark, the werewolf bursts out of the darkness at center screen to attack the Hippy Chick in the phone booth. Unfortunately, the actor, as he mounts the stairs from the left seconds before to get into position, breaks out of the light shadow enough to distract from the 'boo' effect.
Camera shadow on Dr. Kiss (Michael Dunn) at 1:05:48