Talking about errata, there's some discrepancy with the price of a Launch.
The Launch included with the Type-R subsidised merchant (HG p. 138-9) is listed as MCr 5.607. This doesn't correspond to the Launch (HG p. 96) as this costs MCr 2.367.
The Launch in the core rulebook (p. 188) is listed as MCr5.607, which conforms to what the stated cost is when added to a ship, but a lot higher than a Launch on its own.
I came across one (early?) description of the launch as having 2 tons of maneuvre drive (which leads to a cost of MCr 4 for that, and a total cost of MCr 5.607 for the craft, but that seems to be a typo as it should be 1G = 1% of 20 ton = 0.2 ton of M-Drive, and thus MCr 0.4 cost.
Looks like this error has managed to sneak it's way into all the bigger ships having a Launch as a small craft: the Type-R and the Type-M subsidised liner both have a Launch included for the (wrong) cost of MCr 5.607. The prices of both are consistent over High Guard and the core rulebook (and thus, both wrong).
Also, the Type-R subsidised merchant in my High Guard book costs MCr 90.287, in my Core rulebook it costs MCr 81.2683. If I calculate what it should cost, it's MCr 76.212 without the Launch. If I add the "wrong" (higher) price for the Launch (which already has been getting the "standard design" discount) to the "raw" price and subtract the discount over the whole amount (so counting that twice for the Launch) I come close to the Core rulebook price. No idea where that difference comes from, except that (my) core book has a cargo space of 199 while High Guard has 201 ... 8)
Or it's some kind of thing where the Third Imperium requires launches on Subsidised vessels to be certified to a high degree, making them cost what's listed
In my view, for ships with small craft, it should be "calculate the cost of the ship
without the small craft" and then add the cost of the small craft, in both cases calculating for "standard design" or architect fee per craft, so you don't calculate (discount/add) that twice.