There's an interview of Ryan North at Smithsonian.com.

Why dinosaurs? And while the T rex. is a natural, why two other, more obscure dinosaurs? No Triceratops?
I wish I had a better answer than “I had some dinosaur clip art lying around.”

[Best interview answer EVER. ]

Also, the Dinosaur Comics whiteboard is back in stock at TopatoCo.

Speaking of which, I had a phone conversation with my mother the other day. My mother said the book had come, and she had got up to page 49 and COULD NOT GO ON. 

I was completely at a loss.  I have never read Dinosaur Comics in book form.  What terrible thing could have happened on page 49, such that my mother could not go on? (I had ordered my mother a copy of the Dinosaur Comics book, and had been innocently expecting to hear how much she was enjoying it...)

'I got to 'tight wet twat' and I just STOPPED,' said my mother.

I thought: Hm. That doesn't sound much like Dinosaur Comics - I don't THINK.

I cast my mind back over early episodes of DC.  The webcomic has evolved over the years; I once went back and started going through strips from the beginning;  had I missed No. 49? 

My mother said something or other.  I realised that she was not talking about Dinosaur Comics (page 49 of which is, to the best of my knowledge, blameless), but Lightning Rods.  New Directions had sent her a galley.  She had read it years ago and hated it; she had loyally undertaken to read it again, hoping to change her mind, and I had assumed she would hate it again. 

Whereas I had confidently assumed that life in Leisure World would be brightened by Dinosaur Comics.

As, I suspect, it is.