After the Zodiac killer's cryptic message is discussed by the FBI and CIA team in trying to crack the code, the next scene is of a very ordinary couple who happen to be Donald G. Harden and his wife having breakfast. He hands her the newspaper with the code and asked simply if she wants to give it a go. We don't see them cracking it, but Avery tells Robert that a high school teacher and his wife was able to what the FBI and CIA couldn't, three days after it was put in the paper.
The woman with the baby. She survives an encounter with the man who threatened to kill her, and saved her baby by hiding her (I think its a her). The whole thing is scary because at first, when she flags down some other people for help, it leads one to think that the baby was killed.