How did Jerry's wish come into effect? It probably had something to do with having Karen's body.
After the flash of light, everyone had the correct heads on the correct bodies. BUT everyone was still swapped body-wise.
Karen looked at Keiko standing in front of her. The Asian cheerleader fixed her hair and straightened out her swimsuit. Surprisingly Jon's voice came out of her mouth as she panted and spoke: "Hey, Karen baby that was incredible! You sure know how to use that body well. I'm going to have to return the favor when I get my own body back!"
"Jon? Is that you" Karen asked. She turned to the mirror and saw Cole staring at her. "Oh my god " she began to say then quickly covered her mouth with Cole's large black hand. It was odd that her female voice was coming out of the muscular football player.
"Are you all right, Karen? We just made out! You know it's me!"
Karen started freaking out. Where was her body and what happened to everyone else?