Twin brothers Shawn Ashmore and Aaron Ashmore both appear in the show throughout the seasons. Shawn as Eric Summers in Leech (Season 1) and Asylum (Season 3), and then Aaron as Jimmy Olsen from Season 6 on.
Chloe and Whitney were created specifically for the show (they were never mentioned in the Superman comics). However, in 2003, DC Comics announced that Chloe would be introduced into the Superman comics.
Actors Tom Welling, Allison Mack, Michael Rosenbaum, John Schneider, and Justin Hartley are the only actors to ever appear on the show, who also directed episodes of it as well. Although they did not direct the same amount of course since Welling has directed seven episodes; Mack has directed two; and Rosenbaum, Schneider, and Hartley all directed one episode each during the show's 10 year run.
Originally, Tollin/Robbins Productions were planning to do a show that followed the story of a young Bruce Wayne before he became Batman. Since Warner Bros. Studios had decided to do Batman Begins (2005) and didn't want the film to compete with a television show, Tollin/Robbins Productions suggested Peter Roth, President of Warner Bros Television, to develop a show about a young Clark Kent, which later became "Smallville". The idea was later revisited and soon became Gotham (2014).
Milo Ventimiglia originally auditioned for the role of Clark Kent. Although the role went to Tom Welling, the producers at The WB liked him so much they gave him the role of Jess on Gilmore Girls (2000). Ventimiglia went on to play a different comic book-style superhero on Heroes (2006).
Although he plays the lead character, Tom Welling has admitted in interviews that he is not a fan of the Superman comic books. However, Welling believed his lack of knowledge on the character mythology actually helped his portrayal of Clark.
The first live-action appearances of numerous DC Comics characters such as Pete Ross, Oliver Queen (Green Arrow), the Suicide Squad (and its characters Amanda Waller, Deadshot, Rick Flag, Icicle, Plastique and Warp), Brainiac, the Legion of Super-Heroes (Saturn Girl, Lightning Lad and Cosmic Boy), Hawkman, Cyborg, Livewire, Mia Dearden (Speedy), Impulse (Bart Allen), the Wonder Twins, Neutron, Doomsday, Parasite, Zatanna, Stargirl, Wildcat, Doctor Fate and Aquaman (if excluding the Aquaman (2006) pilot).
The Smallville High Student Newspaper that Clark and Chloe write for is named "The Torch," after the student newspaper at Glenville High School in Cleveland, Ohio. Superman creators Jerry Siegel and Joe Shuster worked together on the Glenville Torch while they were students.
The rooms in the show will usually have something that is Red, Blue and Yellow this can include wall color, furniture etc. Also there are times where the coloring in the room (such as the Smallville Medical Center) that the colors of Green and Purple are used (Lex Luthor's old colors from the Superman comics).
Michael Ironside and Peyton List's first portrayal of father and daughter (General Lane and Lucy Lane) in a CW series based on DC Comics characters. They would later play Lewis and Lisa Snart in The Flash (2014).
Due to the Batman embargo that Warner Bros. laid down due to the new Batman movie franchise, Oliver Queen/the Green Arrow essentially replaced Bruce Wayne/Batman. Batman himself would be featured in the comic book continuation of the series, "Smallville: Season Eleven".
In Season 2, Lex Luthor shows Ryan the first issue of the Warrior Angel in a showcase. In the comic cover, Warrior Angel holds a car above his head. In Superman's first issue, Superman also holds a car above his head in the exact same position.
Almost always when he is visiting the Smallville Cemetery, Clark is seen in the same frame with an angel statue as an allusion to his character. In the Pilot, he appears right in front of the statue, making the wings look like they are his own.
As a homage to John Schneider's famous starring role in The Dukes of Hazzard (1979), Jonathan and Martha's email starts with "CNH-320", the license plate number of the General Lee. Also, Tom Wopat guest stars in one episode as an old friend of Jonathan's.
A "crossover" with Supernatural (2005) was proposed but scrapped. Sam and Dean Winchester would have to save Tom Welling from the infamous "Superman curse" that has supposedly victimized several actors that have played Clark Kent/Superman.
Margot Kidder's character, Bridgette Crosby, was meant to become the primary villain of Season 4. After Christopher Reeve's untimely death in 2004, the show's producers decided to incorporate the death of the legendary actor into the plot as his character Virgil Swann was killed off screen. Kidder was not happy with this decision, feeling the producers were capitalizing on the actor's passing. Thus, she backed out of her commitments. As a result, the character of Genevieve Teague, as played by Jane Seymour, was created to fill in as the central big bad for the remainder of the season. Ironically, Christopher Reeve played a romantic love interest opposite both Margot Kidder and Jane Seymour; Kidder in Superman (1978) and Seymour in Somewhere in Time (1980).
It's visually heavily inspired by the Superman (1978) film series though having it's own mythology and storyline. Some aspects such as Krypton and the Fortress' designs and Krypton's explosion are directly taken from the films.
Tom Welling and Allison Mack are the only two main cast members to appear in all ten seasons without leaving in between. Mack did step down to recurring in the tenth season, but was still credited as a main cast member,
In one episode (s01e10?) Clark's father Jonathan Kent is seen driving his pickup with the radio playing "The Good Ol' Boys." This was the theme to Dukes of Hazard starring the same actor, John Schnieder.
Belle Reve is the name of the estate that Blanche and Stella DuBois come from in Tennessee Williams's "A Streetcar Named Desire". Throughout the play, Blanche gradually becomes insane. In Smallville (2001), Belle Reve is the name of a mental hospital. In DC Comics, Belle Reve is the name of a federal prison for super-villains; it is located in Louisiana.
Second live action depiction of a truly bald Lex Luthor as he was traditionally depicted in the comics. In most other live action adaptations, Luthor was bald, but depicted as covering it up by wearing wigs. However, in the serial Atom Man vs Superman, Lyle Talbot's Lex Luthor is portrayed as completely bald.
Five different exterior locations in Vancouver are used as Metropolis: The Daily Planet is actually the Marine Building; The Watchtower building is the Sun Tower; Vancouver Block 736 appears as the Queen Tower; two different buildings are used for the Luthorcorp Plaza, one for the entrance and the other for the upper shots.
Fans strongly demanded Tom Welling to reprise his role of Clark Kent/Superman on Supergirl (2015). He stated that Clark could not exist in that universe because of the different essence between both shows. "There's really nothing in common, there are no parallels at all. I say that being a fan of what they're doing. I think they're doing a great job."
The name of one of the Kryptonian baddies from season 5 is named Nam-Ek, the same name of the race of aliens come to earth (the race of aliens that Piccolo hails from) in the anime Dragonball Z. Nam-Ek is also the name of one of the Phantom Zone criminals in the DC Comics Superman titles, first appearing in Superman #282 (December 1974).
In the DC comic universe, Lex Luthor's relationship with Clark is almost exclusively as Superman; they never even met whilst at school. The exception is an alternative reality one-off story in 1960 which attempted to explain Lex's hair loss. This story had them both as childhood friends but has largely been ignored or discredited since. Lana and Jimmy feature heavily in the comic universe.
While Clark Kent/Superman is often depicted with blue eyes in the comics and most media, Tom Welling portrays him in this version with his natural green eyes. However, some characters still comment on Clark's "blue eyes" throughout the series.
Ted Whittall portrays Rick Flag of the Suicide Squad in this series, and also has a role in Suicide Squad (2016). He is one of several actors to appear in both universes of "Smallville" and the DC Extended Universe.
After Laura Vandervoort's audition for the role of Kara Kent/Kara Zor-El/Supergirl in Los Angeles, she was told by the producers "Don't leave, just wait outside" to which she replied "Don't worry, I won't take off!" meaning she would not fly back to Canada. The crew, however, understood she meant *literally* flying back. "Everyone laughed, and I realized I had made a joke, seeing that Supergirl can fly. I simply meant I wouldn't get back on a plane, but they didn't need to know that."
A FBI agent who happens to be a fan of this series immediately recognized Laura Vandervoort when her picture from V (2009) was used as part of an international identity-theft ring disclosed by authorities in June 2016.
The series suffered backlash from the Internet due to casting an Eurasian actress and an African-American actor as Lana Lang and Pete Ross, respectively. Lana is often depicted as a redhead in the comics, while Pete is a blonde.
The name of Lex's mother, Lillian Luthor, was conceived for this series and is also her name in Supergirl (2015). In the comics, she was originally named Arlene Luthor, which was later changed to Letitia Luthor. An aunt named Lillian was mentioned by Lex in "Superwoman" #6.
Before Smallville, the Martian Manhunter's human alias was typically portrayed as Caucasian. Impressed by how well Phil Morris portrayed the character, the character's main alias was changed to African American in the comics as well.
Since the start of the "Superman" comic book, there has been an abundance of characters with the initials "L.L.," including Lex Luthor, Lana Lang, Lois Lane, Lori Lemaris, Lucy Lane, Linda Lee, etc. "Smallville" continued that naming tradition with several of the characters created for the show, including Lex's parents, Lionel and Lillian Luthor, his brother, Lucas Luthor, and Lana's parents, Laura and Lewis Lang. It is also revealed in a later episode that Tess Mercer's original name was Lutessa Luthor.
With both Chloe and Lana, Clark is tricked into revealing his abilities in front of them. In Season 4, Alicia sets things up so that Clark will show off his abilities for Chloe, and in Season 6, Lana sets things up so that Clark uses his abilities while she secretly watches.
After the 15th episode of Season 10 aired, Smallville took the crown (and the Guinness World Record) for being the longest consecutively running Sci-Fi television serial of all time (10 years without a break). Stargate SG-1 (1997) holds that title with 213 episodes, which Smallville will supersede by 5 episodes by the end of Season 10 (it's final season). Doctor Who however holds the record for the longest running Sci-Fi show in the world, running from 1963 to 1989 and 2005 to 2013, totalling 50 years. Doctor Who is continuing to this day with its 9th series starting in September 2015. Showrunner Steven Moffat stated Doctor Who will run for another 5 years with a feature film set to be released in 8 years. Supernatural has now taken the title and is going into its 13th season (2017).
The first and last close shots of Michael Rosenbaum (as Lex Luthor) are identical. In the series premiere he leaves his car out of the Luthorcorp plant, and appears as President Lex Luthor in the series finale in a very same manner.
A "Chlois" theory was developed by fans who believed the character of Chloe Sullivan was this series' version of Lois Lane. The theory lived on even after Lois herself was introduced, with the "possibilities" that Lois would die or the two would switch identities.
Clark's general fear that he might not be able to keep from hurting Lana during physical intimacy and especially his tense season five conversation with Chloe about this are references to a classic 1969 essay by science fiction author Larry Niven called "Man of Steel, Woman of Kleenex." In that article, Niven postulates that Superman/Clark Kent would be unable to have a sexual relationship with a non-superpowered woman, since his involuntary lack of physical control could result in catastrophic injury to his partner.
The "Smallville Season Eleven" comic book series reveal that Oliver and Chloe's son is named Jonathan. In DC continuity, Jonathan Samuel Kent is the name of Clark and Lois' son, who in 2016 took the mantle of Superboy.
Creators Alfred Gough and Miles Millar admitted they wish to have given a different direction to the character of Lana Lang. According to Gough, "That was probably a three-season love story that lasted six seasons.", which Millar considers to be "torturous and slow".
Kara's origin (an evil Zor-El attempting to use her to kill Clark) is taken from a false origin featured in the 'Supergirl' 2005-2011 run. In the comics, when Supergirl fights an evil version of herself, the "dark" Supergirl lies that Zor-El had actually sent Kara to Earth to kill Kal-El.
The first CW series based on DC Comics characters to depict the Green Arrow in a relationship with that is not with Dinah Lance/Black Canary. Oliver engages in a relationship with Felicity Smoak in Arrow (2012).
In the 'Sacred' episode of Season four, when Virgil Swann's death is announced, the reporter says, "... and now to our on scene reporter, Tom Flores." 'Tom Flores' is the associate producer of "Smallville".
Coincidentally enough, cousins Chloe and Lois both share a similar interest in each others 'soulmate' earlier on in the series. Chloe was in love with Clark during high school, yet he ended up with Lois. While Lois was in love with Oliver Queen, yet he ultimately ended up with Chloe.
In the comics, Kryptonite is rare is and does not cause humans to have abilities. According to the Modern-Age canon, it is actually harmful to people given sufficient long-term exposure as Lex Luthor suffered from cancer caused by his Kryptonite ring.
The badly injured Lex Luthor manages to returning in a brand-new, cloned version of himself is a reference to Lex's forged death and return from his terminal condition in a younger version of himself, initially posing as Lex Luthor II.
Throughout the series there are small innuendos about Clark becoming superman for example at the beginning of s1e11 Clark tells Lana that he doesn't want to dress up in a suit and fly around he's supposedly talking about he doesn't want to become a businessman that travels a lot but he is really talking about becoming superman
The Martian Manhunter is friends with Jor-El and is granted the mission to protect Kal-El on Earth. In Supergirl (2015), Martian is friends with the adoptive, earthly father of Kara Zor-El and is granted the mission to protect her on Earth.
According to creator Miles Millar, the biggest change in Superman's past for this series was the death and destruction caused by his arrival in a meteor shower. This was incorporated in the New 52 version of the Supergirl comic, wherein Kara Zor-El comes to Earth in a meteor shower on Smallville.