Audio problem: When the mayor's leaving the mall as people flood in, the first van to arrive is beeping its horn. The horn sounds as if it's passing him (via the doppler effect), but it's coming towards him - no way should it sound like that. (01:03:05)
Audio problem: In the scene where all the towns residents take refuge in the Prosperity Mall, the mall's janitor/caretaker guy says something to the female sheriff with the camera facing him. In mid sentence the camera angle changes to behind the janitor but at an angle - you can hear him keep on talking but you can see that his jaw is perfectly still meaning that he can't possibly be talking. (01:11:25)
Audio problem: In the shot where David Arquette is at the top of the radio tower he shouts, "You eight legged freaks," but his mouth does not appear to move. (01:15:20)
Answer: Both! The owner of the spider farm was feeding the spiders bugs from the water that had the chemical spill in it. The bugs were contaminated with the chemical, thus contaminating the spiders. Note: The man who owned the spider farm had no idea about the contaminated water.
SAZOO1975