Front bumper, gas cap should be painted body color, tailgate handle shouldn't be painted, door mirrors, FORD on the grill should be black, jack should be in the rear passenger corner of the bed, 6cyl radiators didn't have an overfill bottle, was originally Springtime Yellow, originally came with Silver front bucket seats(that is a correct 66' bench/upholstery and seatbelts though), not a Ford radio, interior door panels shouldn't have the two screws at the top, windshield frame hood latch is missing, spare tire wheel isn't a 66', driver's side fresh air box on the cowl under the hood is a later model is looks like.
All that said, don't let that take away from you bronco. There's a lot of hard to find 66' or 66'/67' parts on there. Hood, eyebrow grill, rear bumper, carb, air cleaner, radiator, master cylinder, fender to firewall brace, door panels, doors, arm rests, door and window handles, tailgate, hard top and lift gate, lift gate handle and lock, dash, dash knobs, emergency flasher bezel, steering wheel horn ring and button, blinker knob, transmission shifter knob, transfer case shifter knob and boot, speedometer, spare tools and location. Lots and lots of good 66' items in really great shape still!! All that stuff mentioned, if the person who restored it doesn't know 66' bronco particulars, like about 90% of the early bronco world doesn't, there's no way the restorer would know that it wasn't correct. It's a cool nice 66'.