The Evans talk to Max and Isabel about her powers that Mrs Evans video taped. When the Government take the tape out of the VCR the tag on the tape states Isabel - "5/10/02". One week later, Max is talking to his dad in the kitchen. Max is standing by a calender with Zan on the kitchen island. The calender says it is April 02.
When the Valentis get home, there is blood on the fridge handle/door. In the next shot, it's gone.
When Isabel is sat on her bed with objects flying around the room, she stands up and says, "Yes, Mother, I'm fine," to her mother downstairs. Later when her parents play the video tape of Isabel to Max, Isabel and Jesse, she is instead heard to say, "Yes, Mom, I'm fine."
When the Evan's parents are confronting Max and Isabel about the footage they recorded, the edge of one of the filming cameras can be seen to the left of the shot as Max stands up and says "We're your kids".