Apparently, Marvel comics approved of the Green Goblin imagery being used this way, so this was not accidental. But is there any explanation as to why the Green Goblin mask was used to begin with? Yes, the truck is supposedly a “Happy Toyz” truck, but still that Green Goblin mask being used on an “evil” truck is a bit over the top in-universe; out of universe was there ever any reasoning or logic behind this production design decision?
To "humanise" the villain of the story. Tech going crazy is just too broad a focus. The mask focuses this vehicle as the "leader", the mastermind if you will. ;)