According to the Easyjet flight status page yesterday for the return flight, it was delayed as the "crew for your flight had to be replaced". Apparently a replacement crew were sent from Luton causing a 6.5 hour delay. I would assume this would be fairly standard procedure to ensure that the crew involved didn't have this playing on their mind whilst operating the return sector - human factors?
Having never visited PSA I have no clue on how chaotic it may or may not be, however from an ATC perspective, why didn't the tower controller send the aircraft around when it became apparent they were aligned to the incorrect runway?
Just my 2p...
-HD-