I've had quite a few facepalm moments:
*Didn't know I could unlock Sten's cage (either playing as a rogue or having Leliana do it)
*Didn't know about the tab key
*Didn't know that all I had to do to keep Leliana from attacking the target as I do even if I changed targets was to change it in her tatics (I cussed that poor woman relentlessly my first couple of playthrus).
*Didn't realize that coirsion was a useful skill
*Didn't know that I had to have at least one skill point or whatever you call it in stealing for that dude to show up in Denerim
*Didn't know you could actually heal the NPC's in the battle at Redcliff (actually learned that one today! lol)
*Didn't really believe that Alistair or I would really die in the end if I didn't do the DR. I went in my first playthru head over heels in love with him and couldn't stand the idea of that uhh witch touching him so I told her no deal. I honestly believed Riodan would take the final blow.....even after he did that dumb bunny move off the top of the tower I kept hoping he would miraculously show up there in the end and take that final blow (hey it happens in soap operas...why not in a video game???

) I just sat there stunned and devistated when my darlin' died.
*Didn't realize you could flirt with Bann Teagan until about my 4th or 5th time thru. When I finally did figure it out, I wasted God only knows how many hours trying to figure out how to recruit him and hunny up with him instead (hey, I'm uhh well...45 yrs old and I feel like I'm robbing the cradle with Alistair....Bann Teagan seems older. lol)
*Didn't know H would put everyone on hold and it wasn't until after about an hour of trying to figuring out how to do that dang bridge in the Urn of Sacred Ashes quest that I finally asked my son how to do it.
*Didn't know that you could form romantic relationships in the game until Alistair kissed me. The only reason I even started playing this game is because I saw my son playing and saw that you could play as a girl. I used to be a huge Tomb Raider fan. When he finally asked me to his tent, I wasn't expecting visuals....I looked at my husband and said "OMG....I just got laid." He just about hit the floor.
All in all, I am hooked on this game. It's way better than Tomb Raider in a lot of ways....There is just so much you can do in it....It's always different no matter how you play and I'm always finding something new each time I play.