Continuity mistake: When the shark is brought up to put the needle in his head, it bites off Jim's arm, leaving only a bit left there, but when they are wheeling him to the helicopter you see that he's got more arm than before. (00:33:50 - 00:35:25)
Continuity mistake: Towards the end of the movie, the Preacher stabs the shark in its left eye with his cross, causing it to bleed. In the later scene, when shark returns to eat Susan, its eye is intact. (01:28:10 - 01:32:45)
Continuity mistake: The man with the cross has a wound on the left hand side of his head. Later in the movie it has moved down.
Continuity mistake: Near the end scene, when the three characters came to the surface, L.L. Cool J. was taken by the shark. When he was taken underwater and when he surfaced, the shark had him in her mouth on the right side. When they went under again and resurfaced, L.L.Cool J. was on the left of the shark's mouth. What? Did the shark not like him on the right side so she switched him underwater? (01:27:30)
Continuity mistake: When LL Cool J is standing on the shelf and reaching for his bird on the pot, it is clear that he could easily reach the pot if he clenched his fingers. Yet, in the next clip, the pot is shown from a different angle and is at least 1 or 2 feet away. (00:53:55)
Continuity mistake: When the shark rises above water with Jan partially in its mouth, its teeth are in about the level of her waist. As Carter grabs onto Jan, it moves its teeth up to the top of her chest. In the wide shot that follows, though, its teeth are back at her waist, then in the last shot of her being pulled underwater, they are up way higher again, at her chest.
Continuity mistake: While Carter is trying to save Jane, he is a few feet above the water. But in a shot from above you can see that he has to bend his body so as not to touch the surface. It would be very easy for him to reach her. But in the next shot, he's high above the water again. (01:06:25)
Continuity mistake: When Carter climbs the ladder to get out of the water after removing the licence plate from the shark's mouth, it shows a shot of his feet and he is wearing sandals. In the tank he was wearing swim fins. He talks to the big boss for a few seconds and the fins are nowhere to be seen. He then walks away with the fins in his hand. (00:08:55 - 00:10:20)
Continuity mistake: Carter pries open a door with a knife that is on as sheath on his leg. The knife breaks and he throws it away. In the final scene, when Carter and Preacher are laying on the wreckage, the knife is clearly visibly back in the sheath on Carter's right leg. (01:05:00 - 01:37:45)
Continuity mistake: When Preacher, Susan and Carter realise the only way out of Aquatica is to swim and they start filling the room up with water, Preacher holds out his hands to Susan and Carter. Carter then holds his hand out flat for Susan to take, and she puts her hand on top of his. However, in the next shot Susan's hand is on top and Carter's is underneath. (01:25:25)
Continuity mistake: When Blake and Dr Susan McAlester (Saffron Burrows) emerge to survey the damaged research facility, you can clearly see coastline in the background, although earlier in the movie we see a weather map showing the facility clearly way out in the the ocean. (00:23:25 - 01:29:20)
Continuity mistake: Near the end when the survivors has reached the surface and LL Cool J gets attacked by a shark. Notice all the blood in the water. Shortly after, when he is pulled up and rescued, you see no blood at all. (01:28:20)
Continuity mistake: At the beginning, when Dr. McCallister is getting off the helicopter, she is wearing trousers, but when she is talking to Franklin, she is wearing a dress. (00:12:45)
Continuity mistake: When Preacher is talking to the Lord about his wrath, he is in a wide area of the corridor with "Sub Level 1-A" written on the wall behind him. In the next shot he is approaching the wide area with the sign again. (00:42:30)
Continuity mistake: When Carter and Scoggins are under water at the panel you can see light on Scoggins face when the camera is focusing on him. However when it cuts to Carter he is pointing his flashlight away from Scoggins. This happens twice during the shots. (01:13:45)
Continuity mistake: Even though the shark just jumped out of the water and ate the bird, the water is still when the preacher is falling into it. A big shark should make some waves in the water. (00:51:55)
Continuity mistake: In a scene near the end of the movie, Carter is swimming back to the wet lab through flooded passageways. At the beginning of the swim, his left shoe is completely untied - you can see both laces floating. In the next full body shot (where his shoes show) the shoe is tied again. (01:13:30)
Continuity mistake: At the end, Carter manages to hold onto the perimeter fence, and the shark goes through. The shark then explodes, and Carter is seen being blown off the fence back the way he came, yet when he surfaces, he's now on the other side of the fence.
Continuity mistake: When we first meet Preacher, he dips his finger into the whip cream and scoops up a good bit, but in the next shot there's considerably less on his finger. Before Preacher even offers "Bird" the whip cream off his finger, the amount of cream on his finger changes between shots. (00:17:05)
Continuity mistake: When the parrot lands on the casserole you see a bottle and some other items floating around it. When it cuts none of the items can be seen around the casserole. (00:51:30)
Answer: They viewed her as a villain because it was her research that backfired and caused all of the chaos, even though none of it was intentional and it was a mistake. But audiences can be ruthless and unforgiving at times. However, the ending did feel like a cheap cop-out that created more plot holes. And many do feel she should have survived and completed her character arc. I don't know why they never offered the ending as a bonus feature on the DVD, but fans started a petition on the Change site calling for Warner to release the original ending. Thomas Jane is on board as well, as he's promoting it on his Instagram account. So that's probably the best way to get Warner's attention if you want to see the original ending.