When Tina runs up the stairs and then falls through, she lands on a blanket but when she stands up, the blanket is gone.
Not a mistake, just a case of very bad luck that not many realize: In an attempt to escape the infamous "Tar man" zombie, Tina runs up the stairs. She ends up falling through the bad stair, mentioned earlier in the picture. Now think back to the beginning, after Freddy and Frank breathe the gas from the tank. Frank runs over and pukes under the stairs. So, not only is Tina being pursued by a brain hungry zombie, she also takes a high fall, and lands in cold puke.