Look at the cars in this picture... The special effecs guys probably found cars that still look presentable enough, but mechanically dead.
From Left to Right
-Daewoo: the S#*box motor crapped out in the first 5 years
-OLD SEL gasser: Her timing chain broke because of the plastic guides not being replaced.
-Dodge Intrepid: Flying through the air; probably one of the worst cars ever (I doubt it made it 150,000 miles)
-Saturn econo-sedan: Some brainless person probably let the oil slowly leak out of it until it crapped out going down the 101.
-BMW 750il: The 12 cylinder over-engineered probably needed a $3,000++ repair and was junked.
-Ford Explorer: (Exploder) another victim of bad maintainence and very poor quality.
It looks to me like Voltron is walking down an urban salvage yard to me.