The scene with guests arriving at Peterschmidt Manor and Stewie describing each one borrows directly from the original Fantasy Island (1977). Even the music is reminiscent of the theme.
In a 2018 episode of OneyPlays, the name Mr. Peterschmidt was used for a hypothetical episode of Family Guy where Peter and Carter fuse together.
The title "Peterschmidt" is a portmanteau of the names "Peter" and "Pewterschmidt".