okay.. Nathan summers / Cable reference on phone booth. firefly posters in the windows at 2:05.. Logan playing at the theater in background of phone booth / logan poster at 2:17
For deadpool no idea. For the x-men movies possibly the route the comics went. I think x-23/laura is the current wolverine in the comics (though i think logan is still around in the comics). If wolverine was ever going to show up in a deadpool movie.
honestly, if Hugh Jackman ever ends up in a Deadpool movie, I expect it'll probably be as himself, the actor, not as Wolverine, because it's Deadpool, and they'll probably have a conversation about Wolverine and how he's not him ^.^