After Biff had his car taken to Western Auto for repairs, Terry mentioned that he and his fellow mechanics had so much manure in the service bay they had to pay Jones $80 to haul it away. Biff sarcastically suggested that Jones probably resold it as well.
Only hours later, Biff would once again crash into Jones's manure truck and end up with a car filled with manure.
Behind the scenes
"D. Jones Manure Handling" was an in-joke reference to Dennis E. Jones, who, as the unit production manager for Back to the Future, was in charge of keeping the film's costs within its budget.