When Professor Reardon (Nancy Travis) places the bandage on Annie's (Kimberly J. Brown) bruised forehead, she does so slightly to the right of center. For the rest of the film however, the bandage is seen to the left of center of Annie's forehead.
When Nick and Annie were trying to change the hallway back to what it was, Annie placed the other hand that was holding her doll on the wall. in the close up right after she did, her doll was still there. After the camera cut to the other characters then back the doll was gone. Then when the wall blocking the hallway was gone the doll was in her hands again.
Though the house is protected by a gate that only seems to be operable using a remote control (as in a later scene there is no signs of an intercom), a pizza delivery man seems to have no problem getting to the front door of the house. But it is plausible that the house opened the gate for him.
The power has been out for hours before Kathy goes to the kitchen to make iced tea. However,when she opens the refrigerator, the light turns on.