Factual errors: When Addison is talking to Richard about how to determine the real mother she said they could do a blood typing, that because the baby is 'double O' that if the girl is A or B she can't be the mother. This is untrue. The only way that it is not possible for her to be the mother is if she has AB blood type, as A blood can be comprised of AA or AO, same with B. If the A type blood is AO, then the mother could give that O gene to her baby.
more