With or without a checklist, the senior moments haunt all but the saintliest of us.
There is no absolutely, copper-bottomed, wire-locked, foolproof way to check the checks, or check the checks for the checks (etc), but one tip I was given seems to help: it's a touch drill. The tactile approach certainly helps prevent some of the 'oh I did that already' screw-ups.
If you're one of the few who haven't yet missed something blindingly obvious, we in the confessional await your input. And isn't confession so good for the soul?
Fly soon, fly lots.