No one is addressing the tweebadoc in the room...who is this "Alvin?" that young Sylvie sees being manhandled by the TVA at the beginning of the episode? He's wearing jeans and a t-shirt, which implies that he is a mortal. Does this mean that Sylvie had a different life on Earth? As a mortal? As a Loki?
Also, finding Sylvie and Loki during an apocalyptic event, which shouldn't trigger a Nexus event, may have been on purpose. Maybe whoever is actually behind the TVA made it seem as a Nexus event so that the agents would pull them out of there. The Time Keepers wanted to see them personally, which means whoever is running the TVA wanted them to meet and possibly discover that the Time Keepers were puppets. This leads to a theory that Loki is behind the TVA and is hunting down all the Loki variants and placing them in an alternate NYC (notice the destroyed Avengers Tower in the background) for some reason.
With two more episodes left, we are either going to wrap this up quick or have one helluva cliffhanger.