From the pictures, I can't see any mistakes. i think it turned out really well!!!
You have to remember that *most* of the people who look at cakes dont' know what to look for, even if they wanted to find some mistakes. Now, many of us might be able to find the mistakes, but typically, the layman won't see anything but the cake as a whole. Not to mention, they aren't going to be looking at it up close and personal, from a few inches away. Usually, the reception is a dark/dim lighted room (as another poster pointed out) and they look at the cake from a few feet away, probably because THEY don't want to fall on it or ruin it themselves.
You braved the trials and tribulations of a wedding cake! Congratulations! And now you are ready to learn and move on! Move past what happened over the last few days and prepare for the next one.