It seems to me that we need some rules related to the operation of these clinics. First, all "natural" rights to your sperm and egg must be waived to start the process. It is a business and a contract, not natural procreation. Something goes wrong, there must be a legal fix to the problem (money) that doesn't ruin a child's life.
There's plenty of law that applies here. There was certainly a contract, and the clinic clearly didn't uphold it's part of the contract (which apparently didn't give the clinic the right to avoid any responsibility for this sort of error as long as they offered the woman in question a morning-after pill in time to prevent the pregnancy). This clinic will end up paying through the nose, and any individuals found to have played a part in withholding the truth from the man will have a heck of a tough time hanging on to their medical/nursing licenses or getting malpractice insurance in the future. However, none of that avoids complications in the child's life, or in the life of the man who (apparently) became the biological father of a child without his consent, due to the unauthorized actions of the clinic staff.
I'm sure there was some sort of paperwork when M.H. made his donation. It would be interesting to know if he relinquished all rights upon making the bank "deposit", or if there is some sort of clause about what rights he actually does have. Whatever the case, I'm sure the simple donation process will undoubtedly require pages of legal documents in the future.