Continuity mistake: When Eric and Cody goes to the back alley somewhere, he unscrews the cap to the kerosene can and sets it down. In the next shot, the homeless man picks it up and unscrews it again.
Continuity mistake: In the film there is a small red-headed boy with one blind white eye. The first time he is on screen he is batting tin cans. He turns to look and you see his deformed left eye. Later in the film in a church you see this child again and the right eye is now cloudy white.
Continuity mistake: When Agent Travis and Maggie arrive at Stark's estate, Travis exits from the rear of the squad car with no assistance from the officer in front. However, police cruisers have no door handles on the inside of the rear doors.
Continuity mistake: Right after Mim snatches Kody from the dentist, when the limo spins a u-turn, the front hubcap comes off. You can see there is no hubcap as the car accelerates, then when the car hits the dentist, the hubcap is back on the tire.
Continuity mistake: In the scene where Mim runs in to check on Cody after waking from her dream, she opens the door and turns on the light, but her hand is nowhere near the switch and it remains in the off position.
Answer: It appears to be some kind of stray animal, possibly a cat from the small size.