A look at the easter eggs from last night's episode of Arrow.

Wondering what comic references you missed in last night's episode? Luckily Arrow Annotations is here to help, providing some additional notes and background info from last night’s episode. Arrow spoilers follow!

Unidac Industries – You’ll recall that Unidac was first mentioned in “Lone Gunman”, when Deadshot started assassinating businessmen trying to purchase the company. Now we know what all the fuss was about.

“Walter’s Still Missing Article” – When Felicity is researching Walter’s disappearance, an article on her computer references the Moore family and Edward Rasmus, both of whom appeared in last week’s “Home Invasion.”

Adam Hunt – Another callback to an earlier episode. Adam Hunt was the villain in the pilot episode, and was later killed by Malcolm in “Year’s End”

Snapdragon – The codeword to get into Alonzo’s casino was also used as a screen name by Lex Luthor to pass along information to the Teen Titans.

Markov Device - The seismic device mentioned by Malcolm this episode references two DC characters, Brion and Tara Markov. Brion is better known as the superhero Geo-Force, while Tara was the traitorous Teen Titan Terra. I’ll cover both in more detail in next week’s column as it’s been confirmed that Brion’s appearing in the episode as a seismologist.

Ted Kord – Robert and Moira attend a fundraiser hosted by Ted Kord. Ted Kord is the second Blue Beetle and was created by Spider-Man co-creator Steve Ditko. Originally created for Charlton Comics, DC purchased the rights to Blue Beetle (and other Charlton superheroes such as the Question and Captain Atom) in the mid-1980s. Kord and his fellow Charlton heroes were incorporated into the DC Universe during the Crisis on Infinite Earths event and Kord became a longtime member of the Justice League before his death in 2005.

Kord took on the mantle of Blue Beetle after his mentor, the first Blue Beetle Dan Garrett, was killed in battle at the hands of Kord’s uncle, Jarvis. While Kord shared Garrett’s name, he was unable to access the powers of the mystical scarab that gave Garrett his powers, and instead used a variety of gadgets and his genius level IQ to fight crime. Kord had a close friendship with the time travelling Booster Gold, and the two often found themselves in amusing misadventures, particularly during the lighthearted Justice League International days.

Kord was murdered in the lead up to the 2005 event Infinite Crisis. Kord discovered that the Checkmate organization has been reformed under the leadership of his one-time friend Maxwell Lord, and were planning on controlling the metahuman/superhuman population. With no one but Booster Gold believing his story, Kord infiltrates Checkmate’s headquarters, but is captured by Lord and is murdered after refusing to join Checkmate.

Kord was also the inspiration for Nite-Owl in Alan Moore's Watchmen, much as his fellow Charlton heroes were the basis for other characters in the comic.

Sagittarius – Sagittarius, the Zodiac archer, was first used as a shell company by Merlyn in “Year’s End”.

Ray and Jean – Ollie and Laurel’s college friends are a reference to a well-known superhero and his ex-wife. Ray Palmer is the size-changing hero known as the Atom, who was once married to Jean Loring, his longtime romantic counterpart. Ray was a scientist who became the Atom after discovering the size-changing abilities of a “dwarf star”. After some solo superheroics, he soon became a longtime member of the Justice League and became close friends with Hawkman. Loring was his attorney girlfriend, and often played a supporting role in Palmer’s superheroics. During an adventure with his longtime friend Hawkman, Loring was driven insane by an alien race.

While Loring recovered and eventually married (and divorced) Ray, her mental issues were thrown into the spotlight during the 2004 miniseries Identity Crisis. In the miniseries, Loring is eventually revealed to be behind the deaths of Sue Dibny, the wife of the Elongated Man, and Jack Drake, the father of Tim Drake, who was Batman’s sidekick Robin at the time, in a bid to rekindle her relationship with Ray. Loring later becomes possessed by the supervillain Eclipso and eventually is killed when her powers abandon her over the Pacific Ocean. In the rebooted DC continuity, Ray works for the S.H.A.D.E. organization, while Rhonda Pindea, an Ivy Town student, is now the Atom.

Bludhaven – We briefly get a glimpse of Bludhaven this episode, the onetime home of Nightwing.

V - Ollie passes by some graffiti that says "V for" while rescuing Walter. This might be a mention to Alan Moore's V for Vendetta, which also featurings a vigilante going after a corrupt establishment. Of course, V's an anarchist and a bit of a lunatic, so there's not a whole lot of similarities between him and Ollie.

And here's one I missed last week:

Question Mark - There was a yellow question mark graffiti prominently featured in a scene with Thea and Roy, which may reference the Question, another DC superhero. The Question has often been tossed around as a hero that could easily fit into Arrow's universe.