Continuity mistake: When Ivan is showing off his ooze to the kids, we see a shot of the kids from the back and there is a girl with a cap covered in numbers. Behind her slightly is Fred in a white shirt and black cap that is on backwards. When we see the kids from Ivan's point of view, the kids have moved. Fred isn't by the girl anymore but is at the back in the centre of the crowd.
Picture added by A Demon