Continuity mistake: Top Dollar shows a snow globe to a female companion near the start. Her grip on the snow globe changes instantly. In some shots she has her fingers on the glass and not in others. (00:23:35)
Continuity mistake: When Sarah is skateboarding, and the guy in the car yells at her to get out of the road, she pushes with her right foot and has her left foot in front (a "Regular" stance), but in the next shot she is riding "goofy" stance (right foot front), with no time to change stances. (00:24:25)
Continuity mistake: Eric smashes the door to Gideon's Pawn Shop and stays outside. The shot shows Gideon on the floor then Eric about 6 foot inside the door. Not enough time has passed for him to get that far. (00:26:00)
Continuity mistake: When Eric is about to leave Gideon, he points the shotgun at him, then holds it vertically. Just after he says "your job is to tell the rest of them..." we see a shot of Gideon, and the barrel of the shotgun is visible in the top left corner, pointing at him again. Back to Eric, and the shotgun's still vertical. (00:30:00)
Continuity mistake: Officer Albrecht gets out his car and takes aim at Eric from behind the car door. The camera changes and Albrecht is walking forward without closing the car door or going round it. (00:30:50)
Continuity mistake: After Eric spreads petrol (or something ignitable), he leaves Gideon's Pawn Shop with the shotgun full of rings. When standing outside, he shoots the shotgun into the building. First of all, I doubt that even petrol could make such a big explosion. Secondly, if you watch closely, the top of the building seems to blow up before the bottom. (00:31:05)
Continuity mistake: When Funboy gets shot in the leg it hits his right, he is then shown clutching his bloody left leg and then his right when he is dragged into the bathroom. It goes back and forth like this. (00:38:20)
Continuity mistake: When Eric puts Fun Boy in the tub and runs the water on him the shower head changes position between shots. (00:40:25)
Continuity mistake: When Gideon is in the bar, he takes the top off the bottle just as the other bloke grabs it. The second bloke then proceeds to take the top off the bottle again. (00:41:35)
Continuity mistake: The can Albrecht drops on the floor when Eric visits moves places without anyone touching it. When Eric says about the hat still being on it's on the wooden flooring. When he walks past to read the file a few minutes later the can is on the carpet. (00:43:25)
Continuity mistake: When officer Albrecht shows the Shelly Webster file to Eric before the "nothing is trivial" conversation, the police hat changes position over the table in every shot. (00:44:30)
Continuity mistake: When Darla prepares breakfast for Sarah, the bottle of juice on the table changes positions between the shots. (00:58:50)
Continuity mistake: When Sara is going to the abandoned building and takes off some wood pieces, the gap between the pieces increases between shots. (01:01:00)
Continuity mistake: When Eric reaches forward to touch Top Dollar's face to show him Shelley's thirty hours of suffering, he reaches up with his right hand, but in the next shot, his left hand is on Top Dollar's face followed by his right hand. (01:29:45)
Continuity mistake: In the scene at the bar with Gideon when the black guy pours Gideon a drink it is only about 1/3 full. When Gideon drinks it in the next shot it is almost full.
Continuity mistake: In the scene where Brandon walks in on Top Dollar's meeting and there's a big shoot out, the guy in the trousers with hearts on them gets shot and killed, but a few seconds later you see him again shooting at Eric.
Continuity mistake: In the scene where Eric kidnaps T-Bird and forces him to drive the hot-rod to the dock, Eric holds a large silver revolver up to T-Bird's head, then removes a black automatic from T-Bird's hand and drops it into the front floorboard. A few moments into the chase we see Eric holding the black automatic to the side of T-Bird's head, and the silver revolver is gone.
Continuity mistake: When Lee takes T-Bird in his car and the chase with the Police begins, the camera flashes to look at the chase through the eyes of the crow, the Police cars emergency lights are strobes, but when the camera reverts back to the chase scene they are the old style rotating flashers.
Continuity mistake: Watch T Bird's facial scars, they change from small to big throughout the police chase.
Continuity mistake: When Sarah is sitting at the Hot Dog stand near the beginning of the movie, her hood changes from being up and down without her touching it.
Answer: There is no explaination given in the films, they are just brought back when the crow feels it is the right time to avenge their murder.