Ben's auto shop is west of Puente de Toledo ("Bridge of Toledo"), north of the Manzanares river in Madrid at approximately 40°24'3"N 3°43'0"W. The area has been developed so the building and the amusement park no longer exist.
As Kid flies over the pond on the bike, he is suddenly wearing a helmet (to hide the stunt double). In the following shots, he's wearing his cap again.
Ben removes one wheel from Kid's truck and tethers it to the ground with a pole and chain. When the buggy is destroyed a short time later Kid's truck has the wheel back on and is untethered.