the sissy bar does look messed up, plus the brake lever looks like it is on backwards, the rear brake is on upside down (from the traditional mounting, plus he used a front brake on the rear) and the chainguard is missing too. makes me wonder what this bike has been through, price isn't bad but you probably couldnt get $50 on CL around here for it.
I dont see a coaster brake arm on the hub so I am guessing he swapped the rear wheel and failed to put a brake on it...