"Abracadabra," she said, pointing to its green shape coming out of town towards us."Abracadabra" is commonly used nowadays just as a "poof—there it is!" and so I think it is here. Alternatively, we're supposed to think that the sleek Virgomare is disporting himself now in granny drag!?
It is odd, I'll admit, that the novel ends so emphatically on the word "south"—when just a page before our PMVs were so determined to "Follow the allroads [a startling word itself] away southbound to the next level." but perhaps the irony here is that Niall's next level will be one free of Pour Mieux Vivre (as opposed to the 46A transporting Niall across the Bay of Biscay to the Escorial, some thousand miles west of Rome).
Lastly on the difficulties of the last page(s), Niall begins "to discern the first strain of something old and sad, the last strains of something new." The former must be the Miserere of the PMV. We don't know what the new strains are but it is worrisome that they are the last of them. Or rather it would be worrisome, this last temptation of Niall Lenihan in the Anal Hell Inn, were the bus not to ensconce and remove him to Mum & Da in Sandycove.