One either side of the front and rear fuselage parts are missing "plugs" to provide the necessary changes in panel arrangements of the short nose Phantoms. Right hand side nose views are a bit more harder to come by and most drawings, if you can find reliable ones, show usually the left side of the aircraft.
On a B/N display aircraft here is what it should be, followed by a line drawing comparison to the actual photo on a C model. I've found photos of this round panel also on early Ds and an early J model.
On the rear of the aircraft the B/N has a change on both left and right, and a