actually, I think didn't notice the return mistake (didn't look too closely), but a major mistake I saw was not putting sp into falkow on turn 17, which would have allowed him to field wipe you.
especially since he didn't need the excess sp, it would have definitely been the right play. and he would have probably won from there.
Edit: saw the return mistake, that's another mistake that the opponent would have likely won if they didn't make.
Needs a new sig, but haven't come up with one.
So here is a message about how I need a new sig but haven't come up with one