When engaged to Luke McAllister, Tina Dingle tells him and his sister Jessica about her oldest brother Nathan's wedding. Nathan is never mentioned again, and Tina's father specifically references having three sons (and then four when he discovers his supposed nephew, Cain, is actually his son) - Ben, Francis (Butch) and Sam.
When Marlon tries to trace the recipient of his late wife's Tricia's heart on 5th April 2004. The telephone number gives for Leeds is 01572 which is actually for Oakham in Rutland.
The telephone number also had 8 digits, that with the 5 in the area code total 13 which is too many for a UK telephone number as these are 11 digits long (occasionally 10 digits).
Christmas eve 2003 the Dingle steal and open a safe from Tate Haulage and it's full of money. The notes shown are £20 notes with Michael Faraday on them. The notes ceased to be legal tender in February 2001.