Stuff you didn't notice... until now.

[druid91]

And daemora heart, or the human hearts you can occasionally loot from human corpses.

Also, Deacon in Fallout 4 is always there, near by in settlements whenever you do something and you can spot him if you try. So when you finally show up at the Railroad he's telling the truth in that he's watching you. Its even more fun if you can get there without him spotting you in any of the major settlements.

I noticed him sitting in one of the memory loungers during your trip through Kellogs memories. Made me wonder how many OTHER times Deacon was around.