(at around 9 mins) Dr. Piper gets her left ring finger cut off by a Totem, yet while she is running, the finger has reappeared.
The baseball cards on Rick's wall change to different baseball players between shots.
Pinhead wipes some of the blood from Tunnelers drill but in a following scene his drill is covered in blood.
At approximately 55 minutes, a pair of strings can be seen when the creature attacks blade.
At approximately 53 minutes, a microphone boom can be seen in the mirror.
(at around 39 mins) The lights are knocked out due to the storm, and Rick explains that his generator is only powering his computers, and hands out flashlights. Despite this fact, there are random rooms still fully lit.