Things that bugged me this year-
*Rushing a blood knot with cold fingers because it was 29 degrees and losing a really nice fish.
*Pulling just a little to hard on light tippet and losing a really nice fish.
*Not setting the hook hard enough and losing a really nice fish.
*Incorrectly choosing which side of a downstream rock a hooked rainbow would run past and losing a really, really nice fish.
*Going for a swim in November because the next step was 3' deeper and spooking a lot of really nice fish.
*Tying a really nice fly, then realizing I forgot to tie in the rib right after the whip finish.
*Tying a really nice nymph, then realizing I forgot to weight the hook right after the whip finish.
*Breaking the hackle or peacock hurl on the final turn.
*Dropping a #22 hook onto the carpet and not being able to find it. I know its out there, mocking me and just waiting for my wife's bare foot to happen by.