It makes no sense for Lois to go nuts for the psychic after she failed to contribute a single thing to the rescue of Stewie and Chris but merely took a 50:50 guess about the outcome. That is in Peter's character but not in Lois'.
The British butterfly catcher refers to his "fanny" when he moons the guys. When British people say "fanny" they are referring to a vagina. However, it is possible he is aware that many Americans use the word "fanny" to refer to a person's buttocks.