down on a  gyro set and sending the blood down through the bed. Heather  Langencamp and Robert Englund, in costume, were on hand to watch the  filming. The room itself was to be turned as the blood flowed, but  it was turned in the wrong direction, and blood began to squirt  prematurely. A door to the room opened, and the fake blood gushed  onto exposed wires, creating a real hazard for the crew.  Fortunately, Englund pulled Langencamp away to safety before  anything serious would have happened, and the sequence was somehow  salvaged. This incident is described by Englund in a booklet in the  commemorative boxed set.