i trigger everything manually and unquantized, so i still manage to get good old-fashioned trainwrecks occasionally.

my quick fix is just manually retriggering both offending phrases at the same time.
yeah, and sometimes things really sound out of pitch. the one thing that has really stuck with me from music school is that any off-key note can become an on-key note if you simply move it up or down half a step.
another soft of trainwrecky thing i get occasionally is when i mix out a sound and the mix suddenly sounds really "naked". the quick fix for this is to always keep a reverb send handy (God bless reverb), and to use a hell of a lot of compression on the master out. with the compression, the loudness of the mix never really changes.
rs