Mentioned by name. Also, at the end of the episode, Kramer and the car salesman hold hands as they decide to keep driving despite the gas indicator light coming on. This is a parody of the ending of the film when Thelma and Louise hold hands as they decide to drive their car off the cliff.
In a "Wrath of Khan"-inspired pan-out sequence used once before in "The Foundation" episode, George looks up in frustration and screams out "TWIX!", a parody of the famous scene in which Captain Kirk screams "KHAAAAAN!"