Visible crew/equipment: After Louis makes the promise to Ellie by telling her, "Church will be fine," Louis heads out the door and down the stairs. The reflection of the boom pole/mic is visible on the red vehicle's windows, just as Missy drives past Louis. (00:16:00)
Revealing mistake: When Louis is trying to get Gage off him near the end of the movie, as he's struggling in a few shots you can plainly see it's not really Gage but a dummy made to look like him. Looks like a doll. (01:33:35)
Visible crew/equipment: As Rachel runs to the airplane through the line of passengers, on her way back to the house from her parents in Chicago, you can see lighting equipment reflected in the glass window, before it cuts away. (01:11:00)
Revealing mistake: When Louis goes to give Gage the shot, if you look closely, you can see that the needle is just a fake prop and doesn't leave a puncture mark.
Continuity mistake: Near the start, when Ellie runs to the tire swing, she does a cartwheel and loses her hat, but in the next shot, her hat's back on her head. (00:04:05)
Continuity mistake: When Ellie falls from the tree after the rope from the tyre breaks, Louis runs with his wife to see how she is. Louis is wearing a plain white crewneck T-shirt with the sleeves rolled up. When Rachael yells "Gage!", you now see Louis wearing a striped white unbuttoned collared shirt and sunglasses. When Louis is running for Gage, he's back to his plain white T-shirt with the sleeves rolled up. (00:05:40)
Continuity mistake: There is no knife on the table when the wife enters the kitchen at the very end, however, she walks straight to Louis, hugs him and then magically a knife appears at the edge of the table which she picks up and uses to stab him (implied - the movie actually ends at that point).
Revealing mistake: When the housekeeper hangs herself, you can tell the rope isn`t even around her neck. It is obviously connected to a harness around her torso.
Continuity mistake: When Jud is falling asleep on his porch he has 5 beers on the table. When he awakens there is only 1 beer on the table.
Continuity mistake: In the scene where the father is in Jud Crandall's house looking for Gage, he is upstairs in the bedroom kneeling beside the bed holding a syringe. After he sees Jud dead, he gasps and you see him bite his fist with his right hand (the hand which was previously holding the syringe). Then the camera cuts back and he is again holding the syringe in his hand.
Continuity mistake: When Louis goes to dig up Gage's body, the grave is covered with purple and white flowers and purple ribbons. A police car drives up with the lights on and Louis turns to look; after Pascow warns Louis not to cross the barrier because the earth is sour, then the camera cuts back to Louis, and the flowers and ribbons are gone but the earth in front of the gravestone has been disturbed and mysteriously a yellow bunch of flowers appears to the right. Yellow is used extensively throughout.
Continuity mistake: When Jud asks for the picture from Ellie, he grabs it with one hand. When the camera cuts he is holding onto it with both hands. (00:49:15)
Revealing mistake: When Lewis gets out of the tub and has a towel around him, you can see he has underwear on.
Continuity mistake: After Gage has been killed and Jud Crandall comes into the kitchen to comfort Louis, Louis is sitting at the kitchen table, and Jud goes to sit down on a chair that is tucked up to the table. In the immediate next shot, Jud sits down without pulling the chair away from the table.
Continuity mistake: As Rachel frantically tries to get home, the left front tire of her rental car blows out causing her to lose control. But when the car swerves off the road the tire is fully inflated.
Continuity mistake: When Louis lifts his cat up, saying "You stink Church" in one shot his left hand is gripping Church around the stomach, but in the next it grips him around the neck.
Continuity mistake: When the high schoolers are carrying Victor's body up in a blanket, and somebody yells "Where's Dr. Creed? Get him up here," the grip of the girl in the blue sweater on the blanket changes between shots.
Continuity mistake: In an overhead shot of the family picnic, there is a metal box on a ground-cloth that is in front of the wicker basket. When it cuts, the metal box is on the left side of the wicker basket.
Continuity mistake: When Ellie sits on the couch and asks "Is Missy in heaven?" the distance between her and Louis changes between shots.
Continuity mistake: When the neighbours' house is burned down near the end of the film, it is shown briefly three more times without any damage.
Chosen answer: Church's behavior had changed after being buried. He was now violent (and working with Gage) and needed to be put down before killing anyone.
Bishop73