Jonathan I out crumble you by a few years.
Back to the subject in hand - I think there was a continuity error re the date/time Rob was dragging his car out of the ditch after being accosted by the witches of Ambridge and getting a flight to Minnesota Thursday night as alleged by PC Harrison whathisname.
How did he get rid of his car, or is it abandoned in a long term car park some where or was a company lease car in which case Justine would have got the keys when he sacked Rob etc etc. These errors allow for Rob to re appear in the near future to terrorise the witches of Ambridge further.