This episode is the second in the first season to burn itself playing with its genre. Roger hitting on Don's wife goes nowhere, for the entire episode, and just manages to make Don look like idiot and an a-hole. And frankly, this ain't The Simpsons, so it doesn't fly.
What was worse was that this whole bit was the show's A plot. So most of the episode was just slow nonsense. Pete looked a little more interesting this episode, although the scene at the department store was as poorly written as anything I've ever seen on TV. Just sloppy, unthought-out, and really trying too hard. I like how we are made to feel Pete's pain about his wife; in this era of pure maleness and domesticated women, his girl's a bigger spoiled snob than most men would want even today.
And poor Betty got tossed around the whole episode. First she's abused for being friendly to a dinner guest, because that's the action of a whore (WE'RE IN 1960 PEOPLE! GET IT! And we'll sacrifice good plotting and realistic character actions just to get this point across!). Then Helen yells at her for giving her creepy son a lock of hair. Which apparently is just insane behavior (BECAUSE IT'S 1960!), and like most TV conversations this one between Helen and Betty at the supermarket is handled in 1/10th the time necessary for it to actually be discussed on an intelligent level for the characters involved. Really, just uninspired, tired writing on half of the scenes here.
Good wideshot vomit effects there at the end though. Don't see that enough on TV. Don's circuituous plan to make Roger vomit is not unrealistic in it's ingenuity or execution, but in real life how would you know the guy's gonna get sick from eating too much and then walking up stairs.
Anyways to sum up, not a good episode, the writer should feel shame.