Mr. Haney's car is a Stutz Bearcat from around 1915.
In addition to sporting a raccoon coat and driving a Stutz Bearcat automobile, symbols of that era's typical college student, Mr. Haney mentions several personalities who can lay claim to some aspect of the popular culture of the 1920s and '30s. There's Eliot Ness, a government agent who enforced Prohibition, hence Mr. Haney's flask with a non-alcoholic drink; there's Rudy Vallee's "Stein Song," which is still the school song for the University of Maine; there's Gilda Gray, an actress/dancer who popularized the "Shimmy" dance; there's Betty Boop, a cartoon character famous for the "Boop-Oop-a-Doop" that Mr. Haney mimics; and there's William T. Tilden, a champion tennis player in the '20s and '30s.
Resorting to the comedic schtick common to this series, Eb asks about Arnold's 'lassitudinousness', a term, like the malapropisms and misappropriated words Lisa commonly uses, that plays on the more appropriate and simpler term 'lassitude'. He's actually asking whether Arnold has been very tired.
Adjusted for inflation, the $8.95 price for the suit Eb buys would equal approximately $84 in the year 2023.
Lisa temporarily gives up cooking "hotscakes" to prepare a new dish: scraped pizza. It's made by scraping the toppings off the pizza and serving just the crust. The scrapings are served later in the show as a separate dish.