These maybe a bit obvious … ‘El Indio’ FAFDM, plus ‘Sancho Perez’.
Betterville Prison camp in GBU … Juan Miranda releasing the prisoners at Mesa Verde, in ‘Fistful of Dynamite’
And for a bit of pure conjecture, Harmonica in ‘OUTW’ must have been doing a 30 year stretch, before eventually tracking down Frank … Bronson was about 47 when he shows up at ‘Cattle Corner’, and in the flashback when Frank hangs his brother, he’s clearly a teenager … what the hell was he up to all those intervening years ???