In the ending montage paying tribute to Mrs. Krabappel, she is seen watching 'The Bob Newhart Show.' Her voice actor Marcia Wallace was famous for her role on that iconic series.
End of episode title card reads "Stampy performed of his own free will". This is a reference to protesters that caused Ringling Brothers circus to shut down because they claimed that the elephants were mistreated.
The audio of Edna's speech at the family meeting is taken from the season 17 episode "The Seemingly Never-Ending Story." She originally said it to Moe in a flashback.
Couch Gag: A UFO containing Marge, Lisa, Bart and Maggie land on the couch on Mars. Homer enters without wearing a helmet and when Marge asks where his helmet is, his head explodes.
Originally expected to air 2/14/21, but a rain delay for the Daytona 500 pushed this episode back.