But he will get at least two lines of dialog. Baby steps.

The hardest part of the job is making two pitches at once - one to convince the public to buy more ketchup, and another to convince the clients that your ad is right for them.

Well done! Ketchup on a hot dog is, as Jeeves said to Bertie, Simply Not Done.

Shake and shake the ketchup bottle.
First none'll come and then a lot'll.

She's Catholic: sex is sinful, sin is sexy.

Robert Anton Wilson worked for an ad agency in the 60s (now wouldn't a character based on him be a good drug buddy for Roger Sterling?) and said that almost everyone on Madison Avenue was a Friend of Mary Jane.

Wasn't it the Electric Circus?

Speaking of jackets: early in this episode Mr Ketchup wore a sports coat with blue and green horizontal stripes that looked fricking awesome. 
And later Harry showed up at the office in something similar, but in brown and gray.

He appears twice in "next week on Mad Men," so maybe he's about to make his move.

On the next Mad Men:
Don and Megan attend a formal event… Ginsberg wonders if he's bothering anybody… Don asks for the check… Roger has the solution to everything… Pete exits his office… Harry shushes somebody… Peggy warns us not to do anything stupid…

Dibs on the towel concession!

"the secretaries… are likely doing more real work in a day than Roger or Bert are doing in a month."
Mrs Pancakes: that's how business is done in this country. At every job I've had, getting a raise or promotion meant doing less work and getting more respect from the higher-ups.

No, cancel the check, and when he tries to cash it have him arrested.

LanaKane: he could call it a Sherwood Anderson.

As a poet Marlowe gave Shakespeare a run for the money and might have surpassed him if he hadn't died young. 
But Shakespeare beat him to shit as a playwright. Most of Marlowe's plays are like a series of tableaus, where Shakespeare's flow.

Don't hate the player, hate the play.

Prithee, surly knave, call him Master Snow, for he hath come to lick thy boom boom down.

infernocanck: Then why did Pope Benedict declare that being homosexual was incompatible with being a priest, and no gays allowed from now on?
(And for the (n + 1)th time, how do I put the name of the person I'm addressing into one of those little gray boxes like all the cool kids do? Disqus FAQs is no help at all.)

"…a poet, whose selfish trade it is 
To keep no beauty to himself."

It was T.S. Eliot, more or less:
"Immature poets imitate; mature poets steal; bad poets deface what they take, and good poets make it into something better, or at least something different."