Cobra Kai's William Zabka: How I Met Your Mother created "Billy Zabka" confusion

TheWrap

Zabka says he was always known professionally as "William Zabka." But he says on How I Met Your Mother, Barney Stinson kept referring to him as "'Billy Zabka. Billy Zabka, Billy Zabka,’ and then people got more comfortable calling me ‘Billy’ and now ‘Billy’ is out there and you see ‘William’ and people think I’m trying to throw ‘William’ in front of ‘Billy,' It’s a big car wreck, dude.”