I am just wondering if the cop had gotten Peter's wallet and identification before he cuffed him. I would figure that he would have searched him first and at least look in his wallet for identification. I don't know about back then, but today they are more looking for weapons before they cuff them. If the cop didn't, lets just hope that being caught off guard and the blow to the face and head will cause him to forget or have a complete blank of the last few hours so he can't remember the red hair or anything about Peter. I don't know if he got a glimpse of JP or not.