I have been wondering about something...
In season 1, when Cersei visits injured Bran and talks to Catelyn, she tells her that her first boy died of a fever, and that he had dark hair. She doesn't say how old the boy was, but Catelyn says that she never knew. This seems absurd, since we've never heard any other mention of a 4th Cersei baby, esp. a dark haired boy who died young.
Also, since Robert was already king when Cersei married him, the firstborn son would have been know about by the whole kingdom, and then the death of the prince would have been a national tragedy.
Is Cersei making this up? Or is this bad writing on the part of the show? Does this conversation take place in the books? Did this boy ever exist?
I know this doesn't change anything in our future debates about the show, but it has always bothered me.