Ascend,
The tail rotor on the 76 is very similar to that on the Black Hawk, that bolted joint at the mid span is the biggest difference. The BH as a bonded joint where the blade cuff meets the spar - recall that the spar twists to allow feathering, and the twisting force is applied through the cuff and through that joint. The CF from the cuff is also resolved at that joint, so it is a busy place.
It happened that the 76 TR was being designed as the BH TR was being tested, and some difficulties were being identified with the bond at that time. Because there was some doubt about how easily it would be solved, the S-76 designer (a fantastic guy named Al Albert, who also lead the design teams for the Black Hawk, the XH-59 ABC and the S-67 Blackhawk) said "Just bolt it and forget about it." The lumps are the smoothed over blot and nut heads.
Regarding its aerodynamic cleanliness, K. D. Wood, an Aero Professor who wrote a great design book said "If it looks like a wing, it will fly almost as good as the best wing." The S-76 can go 50 knots sideward at max gross, so those buried bolt-heads don't harm things that much. Sure does look like a sack full of doorknobs, though.