Thankfully Scott hasn't updated yet, so I've caught up!
Art - Like many people have said the drawing of Dagwood is just off. Plus, for as good as the Rorschach/Popeye drawing was this homage to Doctor Manhattan is the other way.
The biggest thing that caught me is that Doctor Manhattan doesn't have (or rarely has) pupils and Dagwood has them clear as day. Also, the little piece missing from the edge of the picture (top in the 3rd from, bottom in the 4th) just showing a little sloppiness.
I think if their was one thing that I wanted to see that wasn't there for how great Monday's and meh Tuesday's strips is color. I'm not even talking about coloring the whole strip just a little bit of color ala Sin City and 300 that pops out from the gray background. Seeing a little swatch of red on the "Blockhead's badge" or that strange blue on Doctor Dagwood would have made the strips better
Story - Again I really don't get the references to the history of the Dagwood syndicated comic and it seems like it is a little bit of inside baseball. Would most people who read his strip, casual fans, know or care that Dagwood's creator has been dead for 36 years?
I get that he has to make a corollary to the character he's paying homage too but, like other people said, another character might have been a better choice.