There's probably more examples but two recent games spring to mind
Dundee (a) Ferguson elbowed in the face by Fatty Adam right before they got a free kick from which they got their first goal - 2 points dropped
Ross (h) Penalty against Hayes that shuld never have been given - 1 point dropped
The only one I can think that went in our favour was St Johnstone away when Jenks handled before scoring - 2 points gained