In the most recent episode of 'Veronica Mars', Keith Mars and his daughter were investigating the disappearance of Selma Hearst Rose. At one point, Veronica had to scale a wall and jump over to the other side.
As she made the jump and landed on the other side, Veronica simulated the sound effects heard whenever 'The Six Million Dollar Man' was put through his paces.
You know the sound. That dit-dit-dit-dit-dit-dit-dit-dit-dit-dit-etc.
There was no mention of the show; no mention of Steve Austin as an actual bionic man in Veronica's corner of the universe. So while there was no Zonk, there was no acknowledgment that both shows are in the same reality.
As such, there's not a really pressing need to address the potential for a Zonk. Veronica could have just been goofing around, trying to suggest to her Dad that the jump was no big deal.
Or it could be that she actually did know Steve Austin, and she knew that the sound was generated whenever he utilized his cybernetic powers.
Veronica had grown up around her Dad's work as the Sheriff of Neptune, California. Perhaps in his duties as Sheriff, Keith Mars had to work in conjunction with Steve Austin on a case. And in a scene that probably wouldn't have been broadcast even if this had been an episode of 'The Six Million Dollar Man', maybe Keith brought Steve home to meet his family and have dinner. And that would be when Veronica would have had the chance to see the cyborg in action.
Because you know, even as a youngster, Veronica Mars would never have felt shy about asking Steve Austin to strut his stuff.