After driving some unspecified number of miles, Don gets his head on straight and decides to go back for his wife. Unfortunately, upon returning, he discovers from the waitress that Megan left with "some fellows" she was talking to and was last seen headed toward the parking lot. Outside, Don finds a pair of sunglasses that looks suspiciously like Megan's and the first stirrings of genuine fear play across his face. He checks out the ladies' room inside (actually, it's marked "Women," so good on you, fictional depiction of HoJo), apparently finding nothing and then that Dale appears with Don's room key and stories of a kid having had "an accident" in the pool that necessitated its closure. There probably aren't too many things that could make Don forget about that, Dale, so you're just lucky his wife might be dead. Outside, Don looks around in impotent panic, and given how sweaty he is that pool news really is poorly timed.
It's now night and Don sits at the counter checking his watch, which reads 8:10. He gets some dimes for the pay phone from the waitress, who conspiratorially whispers that couples fight in there all the time. "There's no reason to think the worst." And even if you do, at least Megan got to taste orange sherbet before she shuffled off this mortal coil.
Cut to Don calling Peggy, which again makes more sense having seen the full story, since Don knows Megan really was concerned about Heinz and thus might have called Peggy to check in. After downing yet another cup of coffee, he makes a call he really doesn't want to make -- to Megan's mother, asking if she's heard from her daughter that day. The answer is no, so Don has to cover with a story about how he was thinking to get Megan some jewelry and couldn't remember if she was allergic to silver or gold. And you could commend him for his quick thinking, but after today I wouldn't be surprised if the idea of buying Megan jewelry is one for which he didn't have to dig too deep. Mrs. Calvet lilts about what a good husband he is and how it's only gold alloy Megan's allergic to, but Don once again, has checked out of the conversation and gets off as quickly as he can without being, if you'll forgive me, gauche.