Prior to doing Captain America: Civil War, directors Joe and Anthony Russo directed a combined 14 episodes of Arrested Development--among them, "Key Decisions," the episode that gave us the quote, "Watch out for bridges and hop-ons; you're gonna get some hop-ons." Well, turns out they gave a wink to that hop-on-filled past in their recent superhero movie. As captured above by Janel Drewis (via), Civil War featured the return of the Bluth family stair car, which showed up in a few shots of the big airport fight scene.
Also, at the end of the film, it was easy to miss that, despite suffering both physical and mental trauma, Winter Soldier was going to be all right:
Maybe we can hope for a "Loose shield! Watch out for loose shield!" in Infinity War?