Can't tell if the goal should have been ruled out for offside as the left back was not in the picture. Going by his non-reaction could suggest he knew he played Rudden on but that could be my own bias.
As for the other incident, it should have been a sending off. The ref made the decision that a foul was committed so it doesn't matter if Rudden clipped his own heels without contact from the defender or not. I don't buy into the argument that there was a covering defender coming across as the one that was chasing Rudden got to the point where Rudden would have been in a place to shoot from before he did. The only thing the ref should have considered was if there was a genuine effort to play the ball which it clearly wasn't.
Of course it doesn't really matter now but it would have been good to see Tommy Wright blow a gasket.