During the death scene of Steve's roosters, Disney's subtitles describe the mood music as "orchestra: classical". It is in fact specifically "Air" from "Suite no.3 in D major" by Johann Sebastian Bach.
Hayley's name is occasionally incorrectly spelled 'Haley'.
When Avery is talking to speak, the chalkboard has the spelling of "Body"incorrectly spelt as "Bodt" for the first point.
In this episode Hayley finds herself upset that Stan has never told her that he loves her, with Stan himself reluctant to do so. Stan had told her he loved her in the season 3 episode 'Haylias'. While Hayley had been in a semi trance at the time she seemed to have clear memories of everything that had happened.
After the flashback depicting Hayley in grade school, Stan says that the autopsy showed that the hamster was pregnant; a post-mortem examination of an animal is called a necropsy, not an autopsy.