Mitch takes his floater with him when he goes to rescue the drowning girl. It disappears in the shot of him diving into the water, then reappears when he starts to swim.
When Joey sits at the lifeguard tower, there is a floater on the railing to her left. When she leaves to go rescue the boys, the floater has disappeared and has been replaced by binoculars that were right in front of her a second before.
When Joey sits on the bed and cries, her face is suddenly dry when she smiles.
When Joey hugs Mitch on the bed, she briefly glances at the camera.