Other mistake: Henry Silva is interviewed by a reporter played by Sue Lyon in her last movie appearance. She holds a microphone with the familiar peacock symbol of NBC on it, but in the end credits she is "ABC Reporter." (00:50:10 - 01:25:45)
Revealing mistake: After the unmissable scene of a very excited Henry Silva appraising alligator dung, there's a small intermission showing some news on the TV. The "tv" is a literal cutout of a television that frames the footage. It's not even cut properly, the lines are jagged and not smooth. (00:52:50)
Continuity mistake: When Marisa Kendall talks with her obviously arteriosclerotic mother on the phone, she holds the receiver in different ways between shots. (00:59:45)
Other mistake: The alligator baits Col. Brock through a feat of chinese shadow puppetry certainly quite unlikely for the intelligence shown in the rest of the movie, and inconsistent with the movements he's capable of, not to mention the fact that he would have needed to perfectly abscond covering himself in trash bags super-fast, flawlessly, silently. (01:05:00)
Other mistake: When Henry Silva is trapped in the jaws of the animal and screams asking for help from his indigenous sidekick, the beast is hardly crushing his body, more like holding it in place with no damage to his clothes or blood, and then turns it around between shots. (01:06:00)
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)
Character mistake: When Marisa leaves the diner, you can see the door has a "Push" tag. However, the door opens inwards, and in fact to go outside she has to pull. (01:08:00)
Continuity mistake: At the beginning of the party, Mr. Slade has a bunch of steak on the grill, but just two of them when he turns towards the mayor with an angry face. (01:14:30)
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)
Revealing mistake: During the party, one of the security guys shoots the alligator, who then whips him with the tail. The guy flies in the air, and to the left of the screen when he falls there's a string plainly visible to help moving the tail. (01:15:45)
Other mistake: In the party scene, the monster chews repeatedly on a blonde man in a white tuxedo while suspiciously humping a table. This happens while Slade locks the car. There's another shot of the partygoers running away scared, but that is recycled from the earlier bit when the alligator tail-whipped a security guard earlier; the guests that are running away are the exact same (look for instance at the woman with the brown dress and the black belt). You can even spot the security guard flying again in the air like a minute earlier. (01:16:25)
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)
Visible crew/equipment: The vindictive alligator demolishes the bad guy's car; in the shot where the tyre flies off, you can spot the jack under the car. (01:17:05)
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 gatekeeper lets Marisa and David in; the position of his clipboard changes between shots, and so does the position of the other hand, quite more noticeably so since it's off the button column, then on it suddenly again. (01:17:50)
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: 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: 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: 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)
