When the Security Guard in the pump room gets bitten on the nose, he starts shooting with his revolver (a SIX shooter). Count the bangs. He manages to fire SEVEN times.
When that insane gremlin has Billy sitting in a dentist chair and is attacking him with the dentist tool, at some point he asks, "Is it safe?", for many it must have seemed senseless, but it is actually a nod to the 1976 movie "Marathon man", in which, during a scene, Dustin Hoffman is sitting on a dentist chair while tortured with a dentist tool by an ex- Nazi (played majestically by Sir Lawrence Olivier) who keeps asking him the same question once and again.