Corrected entry: When Dr.Atherton determines to test the toxicity of the venom, he extracts a sample from one of the 3 tiny poison sacs on the (now) deceased spider. However, the distance he retracted the plunger on the syringe would have been sufficient to obtain 10-15 cc's, far more than the sac could hold.
Corrected entry: When Jeff Daniels is in bed and he thinks he sees a spider on the wall across from him but it turns out just to be a clothes peg, look carefully, they did use a fake spider then swapped it with a peg. The easiest way to tell is because the top left leg disappears when he gets closer to the spider.
Corrected entry: The deaths as a result of the spider bite are quite inconsistent. The old lady bit off her own tongue because the reaction to the bite was so severe - there are also signs of her struggling because phone off the hook, table knocked over etc. Yet when the couple watching Wheel of Fortune are BOTH bitten, they appear to have just died nice and quietly, his arm still casually draped over her shoulder, and the big popcorn bowl was unspilt.
Corrected entry: In the scene where the main character is fighting the second big spider with a home made flamethrower, you can see that the fire is coming out of the Spraycan itself instead of the fire source.
Corrected entry: The spider specialist should have known that when he vibrated the web he would be attacked by the giant spider, but still he did it.