I just started my second playthrough of Fallout 4 and it made me think about all the things I chose to do during my first one. And one of those major decisions, for me anyway, was to to join the Railroad and free the synths or whatever. And one of the characters in the Railroad I've been most intrigued by was, Deacon.
Mostly because he claims to have been following you ever since you left the vault. Something that I thought, "oh that'd be cool if you could actually find him in some of these key places before you actually meet". And it looks like I'm not the only one who thought that.
Someone recently put up a video of all the times you could find Deacon in "disguise" at different locations before you actually meet him. It's kind of funny to see him there as an NPC you can interact with.
The best part of these videos is the way Deacon reacts or talks to you while he's in disguise. If you've played through the game already and know that he's just an agent for the Railroad, it makes perfect sense that he's sort of fumbling over his words while he's describing the places he's in.
One of my favorite dialogue bits he has is what he says when you find him at Beacon Hill. He simply says he's there for "trade stuff". It's like he's not even trying to hide the fact that he's spying on you. But I guess, if you didn't know who he was and you heard this you'd just assume it was another wastelander who was hooked on Jet or something.
One of the real interesting things about this though is that it shows how detailed Bethesda was with their game development process. They didn't have to make Deacon show up in all of these places before you even knew who he was but they did and it's a nice little easter egg or treat for the people who play through the game a second or third time.