"Whatever Works, Part II"
So, going back to the beginning of this episode, there's Crockett's nameless, semi-infamous, forgettable one-night-stand. Let's look at her a little more closely...
"Please call me, Sonny"/ "Please dance with me, Sonny"
Does he do either? No. Is it implied he's now feeling a lot more guilty about the latter? Yes.
Is it also implied he probably slept with this random woman because under the influence she somehow seemed like Gina? Also yes.
Do the Gina ties stop here? They don't.
So as opposed to this time, where he's completely ignoring her, has to pick up a sordid mess from unfulfilling shenanigans, and loses the Daytona to boot...
...the last time we saw Sonny in his (blue, more optimistic, not-Daytona black) underpants at the crack of dawn on the boat, he was pretty damn involved and happy.
And with good reason.
Everybody was in such a good mood here that despite hearing about Barbara Caro's murder minutes later, Sonny holds onto this memory (as a positive) for a long, long time. TBC.
As far as "Whatever Works" is concerned, though, it's a surprising amount of stuff to catch considering it's all in the background, it's not an episode about their relationship, and Gina doesn't even have any lines! Now multiply that by 100, literally...