Isn't this an example of continuity error for the Unfair Science Fair and Crack the Whip episodes?
In crack the whip the reason behind his invention was because he was angry with people who can grow facial hair. BUT in Unfair Science Fair we see in a flashback when Heinz takes up poetry we blantantly see him with a small beard a cliche of being a poet.
So what is the explaination?
It was probably a fake beard. It's goth, not visigoth! 00:35, April 10, 2011 (UTC)
Well, I thought he was pretty out of his mind in "Crack That Whip." He might've just made it up. Alacrity427 09:54, April 10, 2011 (UTC)
He also has beard stubble in "My Fair Goalie". Maybe he just means he can grow peachfuzz, but not a full beard. I am, what I is. -Ron Stoppable 07:46, October 12, 2011 (UTC)
Also in Phineas and Ferb:Hawaiian Vacation Heinz is seen with a little bit of hair on his face. travisplatypus 22:53, November 3, 2011 (UTC)
My guess is that he can grow some stubble, but it's not as thick and full as he'd like it to be. As for "Crack that Whip," he probably skipped on the fine details due to his hangover.