Let's not act like this was anything more than a filler episode. Featuring a generic plot and another unbelievably unrealistic ending, there was nothing special about this installment, and if you skipped it you really did not miss anything.
One thing this episode did prove was that Sophie Deveraux is not needed on this show, in actuality or in storyline. Gina Bellman was good on the original Coupling show in The United Kingdom, but she just doesn't mesh well with this group. She's pretty much Nate-light, and they'd be better off bringing in another female character to counter Parker, even though that's not happening.