Now, sometimes, a superhero movie Easter egg is just a sly nod of the head to eagle-eyed fans - one which nothing all that much is going to come of. Sometimes, though - as the Marvel Cinematic Universe's plentiful piles of Infinity Gems seem set to soon prove - they're a whole lot more.
And sometimes, they come back...
Take Man of Steel's Captain Carrie Ferris, for instance.
Now, on one level, Ferris (played by Christina Wren) is very much just a mid-level member of the US armed forces.
On another, though, she seems to be a very direct reference to Green Lantern's boss and love-interest (and eventual superhero/villain Star Sapphire) Carol Ferris - as played by Blake Lively in that Green Lantern movie no-one watched.
Now, a lot of people assumed that it was mostly just a throw-away gag - one that implied that the Green Lantern movie was very much non-canon, and little more.
The thing is, though...
Carrie Ferris Is Set to Return in Batman vs. Superman
And that puts a whole other spin on things...
See, one appearance by Wren as Ferris can be written off as an in-joke, but two? In a row?
That seems a whole lot more intentional - and like it's building up to something.
Especially since Wren herself recently revealed to Pittsburgh Magazine that:
"In Batman v Superman, I was essentially in eight pages for four or five days...The bits that I was on set for look fantastic; everyone in it is fantastic. It’s exciting; it’s high-energy; it’s high-action. They are addressing all of the things that they set up in Man of Steel."
Which is both a decent amount of screen-time - and an indication that Captain Ferris is set be involved in at least one major action set-piece.
Add in the way in which Wren addressed the question of whether or not she is, in fact, Carol Ferris...
"So there’s some gossip; this has not been officially confirmed with me at all...But my character’s name is Carrie Farris; there’s a character named Carol Farris who’s the Green Lantern’s girlfriend and turns into this superhero, Star Sapphire. But I have no idea if that’s the plan; they’re not even slated to do a Green Lantern film for several years."
...and it sure seems as though this particular Easter egg might just have a whole lot more to it.