…Once explained, I think the golf-ball-bumps are pretty cool--that the quality of welding and fit at Ghia was so high. Filler is used on the car, but only lead (not plastic) and as I remember on 1076, especially around the area around the lower rear door opening. But other seams (like the front and rear valances) even the welds are a bit hard to find---almost seamless tie-in.
Btw, the oldest color picture I've seen of the Mangusta is in the rear view of the car with the engine covers up in the April 1969 Road and Track...and I don't think its a shadow, it really appears that the engine cover latch areas are blackened out as '1074 is now...Lee