During the opening sequence, a man driving down the road has a wreck and dark liquid (blood) is sprayed onto his face.
While Mike and Carol are searching the cave for her father, they find two skeletons.
When the posse is searching the cave, they see a bat, and the sheriff shoots it dead.
Carol finds her dead father's body, it is shrunken from loss of fluids.
When the posse is attacked by the spider, one of them is struck by a spider leg, and he dies. His bloodied corpse is seen being pulled off the spider web.
While the spider is on display in the school, it has a "knee jerk" reaction and knocks a teacher down. No one is harmed.
When the spider escapes and ravages the city, you see the destruction, and a baby with "blood" on its face sitting in the street alone.
Joe is playing with a normal spider. The sheriff knocks it off the desk and stomps on it (unseen).