Well, Apple I don't know for sure about catching a fish because we never actually got to see it. Just cause he told Anthony this was the way to do it doesnt mean he was telling the truth. Also if you look at the timing of the gunshot that killed him, he would have been at the part of the prayer that says "now and at the hour of our death, Amen." I always thought FFC did this on purpose, but now I am wondering if it is possible that Fredo was so dumb he didnt remember the second half of the prayer.

You also forgot to give him credit for remembering how to get to the nightclub where Superman performed in Havana.