Forum:ME2 Endgame glitch

After finishing my second tunthrough of ME2 I was alarmed to hear my Shepard telling the Illusive Man that people had had to die in order to get where they were. This alarmed me since I had seen no on-screen deaths and was afraid I'd have to redo the whole mission. However, afterwards I noticed that there were no coffins in the final scene and even after continuing to play the game I saw that none of my squadmates were marked as unavailable. Is this a known bug? I only worry because I don't want to risk it being a 'corrupted' save (if so, I'm hoping I can just redo the last mission and not have to start all over again).