Near the start of the film when Davy and Ally are singing "I'm On My Way", as they make their way down the high street dancing they nearly bump into 2 men, those guys were Charlie Reid and Craig Reid AKA The Proclaimers.
Neither of the main pub scenes in the movie were filmed in either Edinburgh or Leith. "It's Over and Done With" is filmed in Glasgow's Griffin Bar and "Let's Get Married" is also filmed in Glasgow - in the Saracen's Head, a traditional Celtic supporters' bar close to Celtic Park.
Most of the characters are portrayed as supporters of Hibernian Football Club, the club supported by the Proclaimer Twins, Craig Reid and Charlie Reid, who wrote all of the songs featured. Behind the bar in the "Let's Get Married" scene, a flag proclaims "Scottish Cup Winners 1902". Hibs did win the Scottish Cup in 1902, but have not won it since.
Clothes shopping, Jane Horrocks holds up a black dress on a coat hanger with a name clearly visible on it. She then holds it up to a mirror and it is on a plain black coat hanger.