This error appears, for me, in the brothel whenever you accept any of the girls services.
If you don't get out of the text fast enough for the cow mini-game the game also gets an error, forgot which one.
Also the dairy get a bitmap error, though you seem to know that one.
By the way, is there anywhere I can report errors besides here, because I imagine there is a dedicated area for it.
Oh yeah, before I forget. Thanks for making this game. Not only does it satisfy a certain *cough cough* desire, it's also a fun game. You don't get that much with Adult games these days. Bravo.
Edit: Typos