The Shadow Hawk SHD-11CS2 is listed as having a role of "None" in the MUL. Given that the SHD-11CS is listed as "Missile Boat", I suspect that the 11-CS2 should also be a "Missile Boat".
I'm less sure whether this is an errata. The Centurion CN9-Ar is listed with Inner Sphere General availability in the Jihad era. This is described as being a field refit of existing 'Mechs, mostly the CN9-A. However, there are some Inner Sphere factions that do not appear to have access to any Centurions during the previous, Civil War, era. This raises the question of what the field refits are being applied to. The affected factions would be Comstar, Draconis Combine, Capellan Confederation, St Ives Compact and Word of Blake.