Rickety Cricket has two functioning eyes in this episode, despite losing the left one in the Season 8 episode 'Pop-Pop: The Final Solution' (S8, Ep1)
In the final scene, the gang is at the train station. A sign on the post reads "No Smoking 640 PC". This sign refers to the California Penal Code § 640, which prohibits eating, drinking, and smoking on public transportation. Although the show is set in Philadelphia, it is actually filmed in southern California.
At the end of the episode when then they send Pete on a train from Philadelphia to Los Angeles, the train he gets is labeled "Surfliner" in large letters. This Amtrak route goes from Los Angeles to San Diego and wouldn't be in Philadelphia.