Continuity mistake: When Carrie confronts Dr Fury at the end, her sweater is buttoned, then unbuttoned, then buttoned again. (01:28:20 - 01:28:55)
Continuity mistake: Near the start, after Lucian saves Sonja from the werewolves. Before Sonja throws Lucian the the sword, Viktor and his guards are walking around the corner next to the ladder. When she throws it they disappear, when Lucian catches it they reappear. (00:06:30)
Continuity mistake: In the carnivorous plant scene, Manny grabs the fruit (the bait), which is sitting in the middle of the plant. In the next few shots, the bait disappears and then is replaced with a bulb that housed the red and blue "wires".
Plot hole: With people around the world turned into zombies, there is no way to maintain power plants, thus no lights should be lit, not to mention the functionality of an amusement park.
Suggested correction: The sequel film gives this a (very flimsy) justification, saying that everything runs on power from dams. Stupid, but at least trying to explain things.
Continuity mistake: When Murphy, Connor, and Romeo arrive at Doc's bar the first time, a cigarette can be seen tucked behind Murphy's left ear, but when the boys enter the bar, it is now behind his right ear.
Visible crew/equipment: In one shot at the end, when all the surrogates fall to the ground, you can see a few crew members (one with a white megaphone) standing in the street in the upper left corner. (01:19:55)
Other mistake: In the scene with the plane that is attacked by the mega shark and subsequently crashes, the camera focuses on one character in particular- a man who states he is "getting married in a few days". It is assumed when the plane crashes that everyone on board dies, yet in the very next scene this man walks behind Deborah Gibson's character as an extra.
Character mistake: When Bower is banging on Payton's hyper sleep chamber from the outside it says Payton, but when it cuts to looking from inside out, it says Bower.
Continuity mistake: When Shawn meets Harvey in the restaurant, he brings in the box of umbrellas which is soaking wet from the rain. When he leaves, the rain has stopped and the box changes from being soaking wet to completely dry to wet again for the rest of the scene.
Revealing mistake: When Vang and Chev are running and about to jump the fence into the power station, look in the fence and you can see the handy foot holds that the actors use to go over the fence.
Continuity mistake: Somewhere during the car chase scene, one of the rear lights of the delivery van breaks. After that it magically fixes itself in some shots.
Audio problem: Drake places the tea kettle on the stove having just finished pouring the water into his cup. The kettle whistle dies down as he places it on the unheated burner. The problem is that the whistling would've stopped soon after lifting the kettle from the hot burner, and certainly wouldn't have gone on while he was pouring. (00:57:10)
Factual error: Despite the film building to a climax during a total solar eclipse, which requires a New Moon, the film constantly shows a Full Moon, which never changes phase over the weeks the film takes place.
Factual error: The large revolver used by Black Dynamite throughout the film appears to be a Smith & Wesson Model 629 Classic. The movie is set in the early 1970s, but this gun was not produced until 1990.
Other mistake: When Wes is running from the bad guys he hides in a St Patrick's day parade. No buildings that they pass have any St Patrick's day decorations or give any hint of this holiday, including the Irish bar they go into earlier.
Factual error: The license plate on the sheriff's car when he arrives at the factory is 5Q49926. In California - where the film seems to take place - that is a "Commercial" license plate issued to trucks and commercial vehicles, but law enforcement are issued "Exempt" plates which are 7 numbers.
Continuity mistake: When Shavoo and Buddy arrive at the storage area, but before they open the cell, they clasp hands. The shot changes, and their hands are now down and no longer clasped.
Continuity mistake: When Maynard is teaching Tony to shoot a gun, Tony fires three shots first. The gun's chamber closes as usual (meaning the gun still has ammo). We see a shot of Maynard, then flick back to Tony and the chamber is now open (meaning the gun is out of ammo). Tony then fires three more shots from an apparently empty magazine before being told to reload. (01:26:40)
Continuity mistake: When Cole fills the water jug at the creek, it is only about a fourth full of water when he caps it and hands it to Captain Burroughs. A moment later as they are walking away, the jug is almost completely full of water. (00:18:50)