Continuity mistake: When David confronts "Ramon", at first he shoots the beast (somehow hurting him more than anyone could do throughout the whole movie, even Kelly who practically shot him in the mouth) a few times, gun in the right hand, flashlight in the left hand. He runs then away, gun in the left, flashlight in the right. They swap again later. (01:20:00)
Continuity mistake: The guy that lies dead next to the crushed car at the party has his head tucked more or less closely under the right arm depending on the camera angle. (01:17:55)
Continuity mistake: During the assault on the car, the vehicle rocks violently in some shots, only to appear perfectly still when it cuts from passenger to driver and vice versa. (01:16:50)
Continuity mistake: After the large mudprint of "Ramon" has been found, David has to make his way back from the lake through a crowd of street vendors and weirdos in general spurred by the presence of the big animal. Just before he meets a bald guy that is carting several plush crocodiles, there's some young fella in a blue and red checkered shirt. David walks past this group and in the next shot after a while he runs in the shirt guy again. (00:49:25)
Continuity mistake: When Kelly grabs his coworker's butt, he does it with the left hand in the Jaws-like POV, but then it turns out he's using the right hand and the left hand is the one holding the flashlight. (00:25:00)
Continuity mistake: When the boss of the laboratory sits on the desk, he moves just the lamp, but the board has moved next to the lighter as well. (00:13:55)
Continuity mistake: Luke Gutchel is at the evil pharmaceutical company. The scientist tells him he wants 'puppies'; it cuts away on him a moment, and the garbage bag has changed position on the cart. (00:08:25)
Continuity mistake: When David opens the manhole to get in the sewers for the last time for the big finale, he is wearing the same blue sneakers he was wearing at the hospital, but as he goes down the ladder he is wearing black boots. (01:19:10)
Continuity mistake: In the humorous bit with Marisa showing up at the gates of the party, her hand is on the window frame or on the steering wheel depending on the camera angle. (01:17:35)
Continuity mistake: The woman next to Slade when he's at the BBQ at the party holds her glass up, down, up in different shots. (01:14:40)
Continuity mistake: At the sour ending of their 'date', Marisa throws a bunch of bills on the table. David's shadow on the wall moves between shots, but he did not. (01:07:45)
Continuity mistake: A guy tries to sell a baby alligator to the protagonist. He approaches it holding the lid of the shoebox in his right hand, but in the reverse shot he's holding it in the left hand. (00:49:40)
Continuity mistake: David is looking at the book about alligators; he holds it with the fingers at the top corner, but in the reverse shot the fingers are not visible in that spot. (00:35:00)
Continuity mistake: When the slimeball reporter is listening to an all-too-chatty nurse, he is leaning against his own hand which is in a different position in the reverse shot. (00:32:20)
Continuity mistake: In his first trip in the sewers, Madison picks a brick; in close-up at the beginning Officer Jim Kelly has the flashlight pointed up. David drops the brick in the water; Kelly stepped forward and the flashlight is pointed down. Back to the original camera angle, and he's back holding the torch up. (00:22:35)
Continuity mistake: The rookie holds at gunpoint the Mad Bomber; in close-up John Lisbon Wood's shoulder is bare, but in the wider angles the shirt is still up and the collar is in place. (00:19:20)
Continuity mistake: In the scene with the crazy guy and his exploding breast apparatus, the shirt and the position of his hands and the bomb keep changing depending on the camera angle. (00:18:25)
Continuity mistake: David helps the coroner put away in the large plastic bag a chewed human arm. A policeman calls him; he places his right hand flat on the railing, gripping it, but in the reverse shot he's leaning the closed fist on it, and tilted at an angle. (00:05:55)
Continuity mistake: David asks for advice to the store owner. The man points at him with his hand turned in a different way between shots. (00:05:15)
Continuity mistake: When Marisa tries to save the hero by telling an old lady to move her car, the window is all the way down looking in, an inch raised looking out. (01:23:05)
