I think they are very much alike.  I like that shot of them curled up together, neither one seems uneasy sleeping with a stranger.  So has Don met his match?  She's independent, intelligent, and likes to drink and sleep around (maybe). Anyone else think she might be around for awhile?

She's too unstable. She encourages the advances, but treats them with scorn at the same time. I think sooner, rather than later, the situation will blow up in Don's face.
And there won't be enough chairs in the whole house for Betty to break.

From her exchanges with Don, it also sounds like this is something she's been through once or twice.  That's a little scary right on its face.

I am fascinated with this plot.  It seems a little like the one with Rachel the heiress, but as you say, jkerouac, it sounds like she's been through the wars.  She may be the one to boil Don's rabbit.

Ohhhh good stalker reference.

Interesting to note that both the teacher and Frank are following the apparent etiquette on having an affair with a family person.  As Frank put it to Betty in his office –“you’re married; you’re supposed to come to me.”  That’s exactly what she and Don did.

Hold on a second, Becky!  Since when do the Drapers have...a RABBIT?!

Lucky Don has never had an outside woman call him at home or even get upset or jealous (that I have seen).  He never puts a foot wrong on his adulterous trail, so this may be the time.

Oh, WB, doesn't every married man have a "rabbit"?

I was kind of disappointed when Don went to the teacher's, Miss Farrell's apartment.  She comes accross as "bunny-burner " {Think Fatal Attraction; however, I think she may be  foreshadowing the "hippie movemnet" that is on the horizon.  She is a free-thinker, sexually liberated, ecologically minded (remember the May Pole dance), running for exercise (?) and relaxation, told Don his insomnia may be because of too much coffee drinking. I can't help but think that this will end badly.  Don is violating his "rules of engagement" as she is close to home and is  someone known to Betty and neighborhood. 
I am also thinking that Sally may be the one to blow this dalliance sky high.  Just a thought.

If Betty catches on to what Don is up to, I'm not so sure she's going to be inclined to let him back in the house this time, especially if she has Mr. Francis on the back burner.  This could be the splitsville for the Drapers.

On the other hand, Miss Farrell seems a little imbalanced.  Anyone think a failed romance with Don might tip her over to suicide?  I don't know.

Don hides behind his images (husband, father, creative director)I think affairs especially like Farrell allow him to feel free and himself for the moment. He has "no people" to center him so he will always drift in and out of his "roles".

I think that the teacher's scornful comments were very 'Ayn Rand'ish.  She needed him to be the aggressor.  She needed to act like she didn't want it and to have him 'woo' her.  She never backed down, but if he hadn't have pushed her to get in the car, or gone to her apartment they wouldn't have slept together. I don't think she would have initiated things that far.  She just opened the door.

I don't think he did much wooing.  Just "I can't stop thinking about you" and "I want you."  Yikes.  Not even "you're so pretty."  He is cold as ice.

Somehow, Betty will find out that Connie isn't around any more and Don couldn't be seeing him in the middle of the night.  Maybe she'll take a little neighborhood stroll.  It should be great fun.

Yes, she's smart. But her unblinking psycho stare is scary.

I think the Miss Farrell character extends the Midge character from season 1 quite nicely. Where Midge offered a real chance for Don to express himself creatively either through her or in reaction to her - Ms. Farrell is something else. She not only tries to dictate the terms of the relationship (at least at first) to him in a sort of educator/pupil way but in the bed scene this week we get a sense that Don is impressed by the fact that she is a teacher. He expresses warmth when he finds her grading papers, and his line "nobody feels as good about what they do as you do" had more of a ring of truth than lie to it. But as the flashbacks suggest, those who have ultimately educated/raised Don have fared poorly and I doubt this will be an exception.

I'm amazed at the difference in both of them, Don in showing warmth and real interest, and Miss Farrell being completely transformed from her steelier earlier self.  She is radiant.  It will end badly of course.

The teacher is trouble.....I think she will be a fatal attraction type.......

The Drapers better keep a close eye on baby gene.