The pose that Diego strikes as he's dropped from the time vortex is the same pose the terminators take when transported in The Terminator (1984) franchise (another series involving time travel). It has also been called a "superhero landing" (coined especially by Deadpool), which is in-character with his superhero complex, especially given all other Hargreeves children blatantly crash to the ground.
Five taunts Elliot slightly, asking if he knew anything about Area 51 or Roswell. Excited by the prospect of new information, Elliot asks Five for the truth. Fans of The X-Files appreciated Five's response as it was a nod to the sci-fi drama series. "Well, the truth is out there" he said with a smirk.