Continuity mistake: When Jill Valentine and Angie are running from the dogs after turning on the gas, Jill kicks the left side of the double doors open. However, when she turns around to see if the match ignited the gas, she has the right door open. When Jill Valentine realizes Alice light a cigarette she starts running, again out of the right side of the door. (Looking at the doors from the kitchen to the cafeteria). (00:56:00)
Continuity mistake: After the gas explosion in the school, Angela reveals that Alice is infected. The woman cop asks "When were you gonna tell us that?" and the next shot shows Alice with burns/blood on her upper left arm. In the next shot as Alice goes to sit down, the severity and position of the burns/blood changes. (00:56:50)
Continuity mistake: As Alice is attacking the guards around the helicopter with the batons, she switches from holding them low to holding them high between shots right after she knocks down the last guard. There isn't enough time or any reason for her to do so in the second offscreen as the others arrive. (01:04:15)
Continuity mistake: Watch the remains of the metal bar that sticks out of the building after Nemesis ripped it off to fight Alice. If you look at the point of the metal it is horizontal. When Nemesis is pushed onto it, it is vertical. (01:08:30)
Continuity mistake: Toward the end, Major Cain storms aboard the helicopter, shouting "Why haven't we taken off, yet?" The shot switches to LJ (Mike Epps)in one of the pilot's seats. As he says, "Because I normally drive Cadillacs" he punches out at Cain with his left hand. In the reaction shot, however, as Cain flies backward, the punching hand is LJ's right hand. (01:12:55)
Revealing mistake: Near the end of the film when the zombies are shuffling up what looks like a parking ramp towards the escape helicopter, in several shots it's painfully obvious that some zombies don't have any makeup at all and a good portion are walking normally, unlike their shuffling comrades. One with blonde hair is even using a handrail. (01:15:20)
Continuity mistake: Near the end, at the chopper crash site, the Umbrella man lifts the corner of the sheet covering Alice's body. From the high zoomed out shot, the guard is facing the waterfall, while the next shot he is facing the body. (01:18:50)
Revealing mistake: Nearly at the end, the scientists find Alice's body at the waterfall, one of the men lifts up the cloth to take a look at her face. Her face is badly burned on one side and she is pronounced dead. However, take a look at the left side of her neck, you can see her either gulp or take in a quick breath of air. (01:19:05)
Continuity mistake: Watch the left side of the mouth piece in Alice's mouth when she is in the tank at the end. In the shot up close to her left there is a plastic support going up, in the next shot of her right the support is pointing down, and after the scientist says "can you hear me?" and the shot is close to her, the support isn't even there. (01:20:30)
Continuity mistake: When Alice is asleep and submerged in the water tank her body is in a fetal position. She wakes up and moves around. The water is then drained from the tank, but she's still in the exact same fetal position. (01:20:45)
Continuity mistake: At the end, as the doctor walks away from Alice after questioning her, she changes from looking up at him to looking down between shots. (01:22:45)
Continuity mistake: Watch the scene where Alice almost pokes the scientist with the pen. In the close up shot of the guy's face, she almost poked him in his left eye. In the far shot, the pen is being pointed at his right eye. (01:23:30)
Continuity mistake: In the scene where the Nemesis kills the 13 S.T.A.R.S members, after it blows up the sniper on the roof an additional S.T.A.R.S member can be seen outside the building on the right who wasn't there earlier. He then disappears shortly afterwards.
Factual error: When any character's automatic pistol runs out of bullets, the slide doesn't lock open. All the weapons shown are of a type which should.
Continuity mistake: At the end of the film when Alice gets her memory back, she grabs a pen and points it very close to a man's eye, then the camera changes shot still looking at Alice and the man but the pen is much further away from the eye than before.
Revealing mistake: When Alice fixes her broken finger, you can see that the finger (and the entire hand) is made of rubber. This is even more obvious on the Blu-ray.
Continuity mistake: When Alice and the group are going to raid the Umbrella guards and steal the helicopter, one of the men looks through binoculars with night vision. He looks at the helicopter, then looks to the right of the helicopter, yet in the next scene a second later, his head is in the same position as it was when he looked at the helicopter, before he looked to the right.
Continuity mistake: When Alice slides on the floor, she shoots up a hole in the wall and goes down it, dislocating a finger on her left hand in the process. In the next shot she straightens it out, and the finger is on her right hand.
Continuity mistake: In the DVD, at the climax, just prior to when Alice is forced to fight Nemesis, she has a conversation with Thomas Kretschmann (the dude with the leather coat). During the conversation, one shot shows Alice with blood trickling down her neck and some bruises on her face after she previously had no injuries. Moments later, her face is back to normal. Later, during the fight with Nemesis, you see that that is where she sustains her injuries.
Factual error: When the nemesis creature fires a rocket-propelled grenade down the laundry chute/garbage chute at Alice, she protects herself from the blast by a plastic cart. When Alice tips the cart it warps and bends, and even more obviously when Alice leans on the side. There is no way this would have worked, the plastic cart would have been destroyed along with her.
Answer: The newspaper clippings we see in her apartment at the start refer to a 'mansion incident' - this in fact relates to the events of the first Resident Evil game, when Jill and other STARS members were trapped in a mansion overrun with the T-Virus. By the end of the game Jill knows exaclty what the T-Virus is and what its effects are.
Even though it mentions it in the newspaper clippings in the movie she wasn't even at the Mansion so therefore she wouldn't have known about the t-virus in the movie.
She was at the mansion prior to the events of Apocalypse, and one of the first ones to know about the virus before it hit Raccoon City.