When the Puma visits Peter at the end, it states "I get it now, Who is the man's name". This is the punchline to an earlier set up, when Peter said "I'm asking you who's on first" causing the Puma to attack him. Peter should have said "I'm telling you who's on first" for the joke to work.
At the end of the show, Peter tells Lois that he should have listened to her warning about the puma. However, Lois never warned him after he told her about the puma, but instead decided to let him learn a lesson.