There has been more than one Aunt Hortense in the Simpson and Bouvier families. In the Season 2 episode "Bart Gets Hit by a Car," Bart is on an escalator to Heaven and he sees an old lady on a cloud and says, "Aunt Hortense!"
Taco Hut are parodies of both Pizza Hut and Taco Bell, both owned by Yum! Brands.
When the Sea Captain hangs up the phone when Bart and Lisa enter, he says "Call me back Ishmael." This is a reference to Moby Dick's famous opening line, "Call Me Ishmael."
The term "Krustyana" is a reference to "Disneyana", a collective term for vintage Disney merchandise.
The IRS Burger menu's food names are a reference to various tax-related terms:
Tax Burger is taxes.
IRS-wich is an obvious reference to the IRS.
Dependent-size sodas are a reference to "Dependents", or people who rely on another person for income.
FICA-ccino is a reference to the Federal Insurance Contributions Act tax, which is the law that mandates that any and all paychecks to various employees at various jobs have a significant percentage of their wages be taken away for tax purposes.
Although not menu names, the names for the trash and recycling repositories are called "Gross Refuse" and "Net Refuse", respectively, alluding to the gross and net index in economics.