The only time in the series which the names of the characters are listed under the actors who provide the voices, during the closing credits. This was done because the staff often received questions from fans regarding what characters each voice actor provided the voice for.
This was the first episode to feature Grampa's full name, Abraham Simpson. Matt Groening named the main characters after his own family members (except for Bart, an anagram of brat, which he substituted for his own name), but refused to name Grampa after his grandfather, Abram Groening. He left it to the writers to choose a name and they chose "Abraham", not knowing that it was also the name of Groening's grandfather.
Three of the people waiting in line to ask for Grampa's money are dressed up as Darth Vader, the Joker, and Spock.
Frink was originally written as a mad scientist, but when Hank Azaria ad-libbed a voice for Frink, he did an impression of Jerry Lewis' The Nutty Professor (1963) character, and the writing staff started making Frink more of a parody of Lewis. Frink was named after writer John Frink; however, that was before he became a writer for the show.