The scene in the basement were actually filmed in a garage at a separate location from the mansion.
The blood squirting effects seen in the film were accomplished by using an old fire extinguisher filled with blood and tubing fed up the actors' bodies.
There was originally a fight scene with Sugar Brains, the female burglar, that was supposed to take place. Due to a packed weekend shoot and most of the crew ready to travel back home, the director decided that she would just give up and leave.