When the two medical students are speaking to the man-on-the-street interviewer, they say they're from Oshkosh, to which the interviewer remarks, "Ah, up near Sheboygan." Then, later, after the two guys skip out on them in the bus station, Shirley remarks that they "traveled 30 miles and fixed a flat tire just to get dumped". Oshkosh is actually approximately 90 miles northwest of Milwaukee, and nowhere near Sheboygan.
It's supposed to be a very hot day, yet in the closing scene where everyone is sitting on the front steps, Carmine is wearing long sleeves, Edna is wearing a sweater, and Lenny is wearing his red jacket.