The title is an allusion to the Irish folk song "Who Threw the Overalls in Mrs. Murphy's Chowder?" written in 1898 by George L. Giefer.
A Spanish-dubbed scene from this episode appears in Knives Out (2019), which also involves murder at the theoretically festive gathering of a dysfunctional family.
Amos tells a woman that the deputy who handled cats in trees isn't there anymore. This is a reference to Deputy Jonathan Martin in "If It's Thursday, It Must Be Beverly." (4.7)