Alien Blood: When Exley is struck in the head by a baseball, a few drops of greenish, highly acidic blood are left on a catcher's mitt that had been used to cushion his head. When he's killed by the Alien Bounty Hunter, after declaring that his human face "is my true face", he bleeds differently...
(Arthur Dales cradles the dying Josh Exley, and moves to check his wound.) Exley: Arthur, don't touch it! Our blood is like acid to you people! Get away, Arthur! Just get away! Arthur: It's just blood, Ex... Look. It's just blood... Exley: (looks at the red human blood on his fingertips in wonder and awe) ... How? (smiles, laughs,and dies)
Baseball Episode: Mulder is fond of baseball. Who knew? He bonds with an older cop who tells him a story about fun-loving alien who chose to be a human and play baseball.
Alien Bounty Hunter: As your executioner, I show you my true face before I kill you. (shapeshifts into his alien form) Show me your true face, or you will die without honor. Exley(remaining human) This is my true face... Alien Bounty Hunter: ... So be it.
Cliché Storm: Though the episode isn't really, Mulder and Scully engage in some witty banter that includes throwing cliches back and forth.
Scully: Mulder, this is a needle in a haystack. These poor souls have been dead for 50 years. Let them rest in peace. Let sleeping dogs lie.
Mulder: Well, I won't sit idly by as you hurl cliches at me. Preparation is the father of inspiration.
Scully: Necessity is the mother of invention.
Mulder: The road of excess leads to the palace of wisdom.
Scully: Eat, drink and be merry for tomorrow we may die.
Mulder: I scream, you scream, we all scream for non-fat tofutti rice dreamsicles. (grabs Scully's dreamsicle and eats it)
Game of Nerds: "Reading the box scores, Scully. You'd like it. It's like the Pythagorean Theorem for jocks. It distills all the chaos and action of any game in the history of all baseball games into one tiny, perfect, rectangular sequence of numbers. I can look at this box and I can recreate exactly what happened on some sunny summer day back in 1947. It's like the numbers talk to me, they comfort me. They tell me that even though lots of things can change some things do remain the same."
One Steve Limit: Averted as a way to explain the change of actors for Arthur Dales from Darren McGavin to M. Emmett Walsh; McGavin was having health issues and was unable to reprise his role. Turns out this Arthur Dales is the other one's brother. Yes, they are both named Arthur. They also had a sister and goldfish named Arthur, as well.