[WARNING: This article contains spoilers for Deadpool.]

With each new film in a superhero or comic book universe, there comes a wide variety of inside jokes, homages, nods to the comics, and even celebrity cameos aimed squarely at the comic book crowd. Since it's the sense of humor and fourth-wall-breaking nature of Deadpool that made him a compelling character to begin with, it's no surprise that his solo film had almost too many references or easter eggs to count.

Considering how veiled, subtle, or niche some of star Ryan Reynolds' references really were - and given the speed with which some of them are delivered - we thought it worthwhile to break down the truly hidden or nuanced bits of trivia for fans. Whether you're a diehard fan of Wade Wilson, or just a casual movie fan who would like to see how many jokes and one-liners they completely missed, we hope our list is exactly what you're looking for.

Needless to say, there will be plenty of SPOILERS in our list of Deadpool Easter Eggs & Hidden References.

"Rob. L"

The nods to the comic book creators are plentiful, and it doesn't take long for the crew to start throwing them around. The movie opens on a slow-motion pan through a tumbling SUV, with a coffee cup clearly visible floating through the air. The camera tracks close enough for audiences to catch the "Rob L." written on the outside of the cup, but some may not realize it's a reference to comic writer and artist Rob Liefeld, who co-created Deadpool more than two decades ago (don't worry, more cameos are still coming).

The First Green Lantern Shot

Fans knew that there were going to be some shots taken at the expense of Green Lantern, Ryan Reynolds' previous attempt at bringing a beloved comic book character to life. Surprisingly, the jokes aren't cruel in any way, and the first throwaway laugh comes in the same opening sequence. One of Deadpool's victims' wallets is seen floating through the SUV, with what looks to be a collectible card of a man in a Green Lantern costume (and grinning ear to ear). The suit isn't distinguishable as GL (since the rights would probably be hard to wrestle), but the joke lands all the same.

Hello Kitty

On top of the card and coffee cup, a tube of Hello Kitty lip balm is also tumbling along with the SUV's occupants during the title cards. It's safe to assume that Wade brought it with him into the car, since his affection for the Japanese brand - which somehow makes complete sense - was earlier established by the movie's official Twitter feed. As the sole Twitter being followed by the mercenary's online crew, the appearance here is a joke with a suprising number of levels.

Someone Order a Pizza?

Ryan Reynolds makes his un-costumed debut in the movie in an unconventional way, having broken into a stranger's apartment and ordered a pizza to their door - before carrying out the job he was hired for. The scene is immediately familiar to comic readers, since it's pulled straight from the pages of Deadpool #10 (2012). Unfortunately for the pizza boy (here Gavin instead of Jeremy), Wade really did end up killing him as part of his contract. So the movie version is actually a softened, sugarcoated one, it seems.

Famous Feige's

It's hard to look away from the non-stop one-liners from Reynolds in that same scene, but get an eyeful of the pizza box. Despite the mustached Italian chef on the outside of the box, it's clearly shown to have been ordered from "Famous Feige's" - an overt reference to Marvel Studios boss Kevin Feige. Despite Deadpool being made at Fox, that was actually where Feige got his start in the genre, having produced X-Men, Daredevil, Spider-Man 2, and even Blade: Trinity. Hard to say which job landed him the cardboard cameo, but it's a sweet touch all the same.

Sister Margaret's School

When the other mercenaries and contract killers in Wade's line of work need to find a job, or just kick back, drink some beers, play some pool, and crack some skulls, they head to the ironically named 'Sister Margaret's Home for Wayward Girls.' It fits perfectly with the humor of the movie, but Sister Margaret's is actually the nickname given to the bar in the pages of "Deadpool" comics. It's officially titled the Hellhouse, with the owner and contract dispatcher, 'Patch' having been combined into the character of Wade's trusted ally, Weasel (T.J. Miller).

"Meeting New and Exciting People..."

When recounting his days spent serving in the Special Forces, Wade lets Weasel know that it wasn't all bad, since he got to "travel the world"; his friend completes the sentence for him, already aware that he traveled to "exotic places to meet new, exciting people... and then kill them." He doesn't actually reveal how he knows what Wade was going to say, but movie fans with good memories don't need him to - it's dialogue lifted directly from X-Men Origins: Wolverine.

Creator Cameo

When Wade actually enters the bar, he greets two patrons at the end of the bar: the big, burly 'Buck' is first, followed by a much less enthused greeting offered to 'Liefeld.' Yes, once again, that's co-creator Rob Liefeld getting the nod, and a cameo as one of the bar's patrons on top of it. It's safe to assume that plenty of other writers got their chance to appear in one form or another in the bar, but fans may have a hard time telling fact from assumption. For instance: is the server named 'Kelly' a nod to famed "Deadpool" writer Joe Kelly, or just a random woman's name? We might never know...

Vanessa Carlysle a.k.a. Copycat

The movie focuses on Vanessa (Morena Baccarin) as the true love of Wade Wilson, but the comics told a very different story. Vanessa Carlysle was also known as Copycat, a mutant capable of shape-shifting. The movie doesn't come close to approaching the idea - perhaps in a sequel? - but she does allude to the power when taken hostage by Ajax. She claims that she's played a lot of parts in her life, but a damsel in distress isn't one of them. Only time will tell just how literal she was being...

Light Reading

Long before fans knew that the Deadpool movie would be guaranteed to land an R rating, Ryan Reynolds and the crew had some fun with the announcement. Aside from Reynold teasing a PG-13 rating on April Fool's Day, he also appeared in an Extra interview with Mario Lopez. Lopez regretted the interview, since he wound up knocked unconscious/murdered by Deadpool in costume. Apparently, Wade actually feels guilty: during the short break in Wade and Vanessa's marathon love affair, Wade can be seen reading "Just Between Us," Lopez's memoir.