Dawson Casting: Harry's voice actor, Andrew Chalmers, was going to be thirteen that year. In later episodes, his voice gets deeper because he hit puberty.
Channel Hop: In The US- the show went from Cartoon Network to Qubo.
Screwed by the Network: Would you believe that Playhouse Disney Asia (who had the rights to the series in Asia and is now known as Disney Junior Asia) did not air Season 2 onwards of the show?
Cartoon Network didn't air Season 2 either when the show was on "Tickle U," but then again, that predictably only lasted a few months before getting the firework. The series later moved to Qubo in the U.S., which may or may not have the second season.
The show is also carried by some online providers like Netflix, but these also don't have the second season, at least not in the United States.