I too thought I had missed something for the first 15 or so minutes, though the "visit Cuba" sign was another good clue not mentioned yet. I thought this was a very entertaining episode, though it was leaning more towards the filler side. It was nice to see Ellen again, if only for a little while, and I enjoyed all of the little changes made due to not sinking the Titanic.
Balthazar was at his witty best again, and I enjoyed his badinage with Sam and Dean, it was an amusing scene that made everything make sense. I did like The Final Destination vibe I got, seeing as I am a fan of the series, and I thought the introduction of Fate was well done, since it was the first time on the show one of the Sisters was actually seen (liked the librarian talk between Sam and Dean, too).
I felt like I could understand her position, and I liked how it connected back to the main plot, with Cas growing increasingly desperate. I do wonder if she meant war machine as a literal thing, or if she was just referring to his fight as a whole, and I also felt like it was implied that he and her had some kind of relationship before, it’s possible and it will be interesting to see if she will come again.
I liked the “One Way or Another” scene, reminded me of Mystery Spot, and I felt like this was overall just a fun piece of filler that also connected some plot points left dangling and cleared up some questions also floating around. A great return from the Hellatus, and I cannot wait for next week’s episode on my birthday! A 9.4/10