When Peter is on his way to the bathroom and is bombarded by multiple people vying for his attention in different ways, this mirrors a scene from the movie, "Airplane" where Robert Stack's character is bombarded by solicitors at the airport and handles them in exactly the same way by beating them up one at a time. The music is also the same.
Peter's mother Thelma Griffin makes her last physical appearance in the series when her casket is opened so her cat can be buried.
When Peter finds out his mother died from a stroke he comments about hosting New Years Eve and talking funny he is referring to Dick Clark who hosted New Years Rockin Eve until he suffered a stroke.