The song performed after Lois' pregnancy test comes back negative was written by Alec Sulkin and Alex Borstein, and sung by professional Hollywood studio singers [REF].
The unsafe homeless man with whom Peter was seen leaving a youth-baseball team in Stewie's flashback was originally based on John Wayne Gacy, but people claimed he didn't look scary enough, so Povenmire changed the character completely to that of a homeless man [REF].