[dahdum]

It’s the same in both, it was deliberate. Wikipedia lists a potential reason.

> The title “Wolfs”, a grammatically incorrect plural of Wolf, is an apparent reference to the character of Winston Wolfe (aka “Mr Wolf”) - an iconic “fixer” in the Quentin Tarantino film Pulp Fiction. https://en.wikipedia.org/wiki/Wolfs_(film)

[gizajob]

I don’t buy it.

[satiric]

Well do you talk about Nissan Leafs, or Nissan Leaves? I'd probably use the former

[gizajob]

I can’t say I often have cause to talk about multiple Nissans. Plus the car is called a Leaf.

Regardless of who is correct or not, the bus advert to me as a British person reads and scans as a spelling mistake or grammar error. Googling to find they’re allegedly talking about Winston Wolfe doesn’t remedy that problem. Plus that would be Wolfes.

[dahdum]

It reads as a mistake to me as an American too, and I expect most of us. It’s an artistic choice.