Other mistake: David's wife is looking inside the microscope at what she describes as a protein found in the saliva. It does not quite look like a protein, and in fact it's a reused (it's exactly the same) microscope image from the previous movie, where Marisa identified it as" a section of the pituitary glans of a Lhasa Apso." (00:12:00 - 00:51:25)
Other mistake: David and the others help out of the sewers one of the alligator hunters. David asks him "who's still down there" and he says "Hawk", but there were other 3 people (relatives and friends, even) besides him; Hawk is the last one alive, sure, but he can't know that. (00:56:55)
Other mistake: When the alligator crawls in the sewers after the helicopter scene, the footage is directly ported from the previous movie. (01:22:15)
Other mistake: The scene in the semi-underground wrestling match features some old time territory wrestlers, namely Professor Toru Tanaka and one of the many evil Russians (he was Canadian, really) of pro wrestling, Alexis Smirnoff. In the end credits though, his name gets feminized as Alexia Smirnoff. (01:27:55)
