Kara's FRED mistakes is a good reference. On another note, before I released Rogue Ep. 1, I asked for some testers to run through the campaign a few times as well, and they managed to pick out dozens of bugs and problems that I wouldn't have noticed myself. The problem with testing the campaign yourself is that you know the workings of your missions, so very little is a surprise to you. Testers, on the other hand, are completely new to the missions, and they can play through the mission differently than you might have and spot whatever bugs may arise through that.