It was too short to work out what they were saying.
Pegg's work in the first film was better. In the second one he was all over the place probably because he had to to a lot of shouting, which he only had to do at the end of the first one. It's incredibly difficult to shout convincingly in an accent that isn't your own. On the bright side, he had some real Brigadoon moments, like the late great James Doohan did every time he opened his gob.
If you want Scottish accents, watch Trainspotting or Brave. Or even if you watch DW, the tenth Doctor in Tooth and Claw.