When Frank is telling the family about how he watched Claudia (the cleaning lady) wash his glass, he doesn't deny it and says "Well yeah, I'm not a monk". Before deciding to pursue a career in acting, Peter Boyle was a monk in the Christian Brothers order.
In this episode Ray addresses his mother-in-law Lois as 'mom', and when he does this Marie is within listening distance in the next room and acknowledges this. However in "Call Me Mom", Marie is shocked to hear Ray call Lois 'mom'.