After going through quite a few books on Aikido techniques, one thing that really attracts me is when the book explains the common mistakes that people make. I often find myself making these mistakes, so such explanations have been very useful.
Thus, I have started this thread to collect everyone's thoughts on common mistakes they have seen or made.
Just to get the ball rolling... here are two common mistakes I've made:
(1) Raising my hands too high for shihonage...if my uke is kind, he will pull me backwards as a reminder
(2) Not kicking my back leg high enough when doing a high breakfall... this causes me to fall heavily on my upper body (ouch!)