I think a lot of parents are taking themselves and this show too seriously.
Personally I don't rely on fictional characters such as Blippi, Peppa pig and Bing to educate my child.
Providing the content is not inappropriate and my child is entertainined then as far as I'm concerned whatever the TV program she is watching I'm happy.
Blippi entertains my daughter, sure from my perspective he is annoying and cringe, but it's not about me it's about how my child perceives him.
And yes I saw the episode where his zipper was down. It should have been edited out, it is strange how it wasnt noticed by blippi or the camera person.