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- Actor Allusion: This is the third film where Keanu Reeves kills himself to save the world. He had first done so in The Devil's Advocate and then again in The Matrix Revolutions. In both this and the former, it's quickly undone with a Reset Button.
- Deleted Role: Michelle Monaghan had a supporting role as Constantine's demon lover Ellie. Most of her scenes were cut. She can be seen briefly in the hospital when the sprinklers are set off - shouting "Holy Water!"
- Dueling Works: With Hellboy, which was released a year earlier. The film was even retitled from Hellblazer to differentiate itself. The two movies both used the same prop as the Spear of Destiny.
- Executive Meddling: The reason why Constantine was change from British to American — the studio heads wouldn't back the film otherwise.
- Fake American: British actress Rachel Weisz as both Angela and her twin Isabel.
- Jossed: A rumour circulated that the change in nationality from British to American was to accommodate Keanu Reeves. However the original script had a British Constantine as the lead character, and studios wouldn't touch it. After they changed the lead to American, it was immediately picked up.
- Playing Their Own Twin: Rachel Weisz plays the twins Angela and Isabel.
- Real Life Writes the Plot: The first scene was supposed to be set in Istanbul. But budget constraints led them to change it.
- What Could Have Been:
- The film was originally greenlit as a Nicolas Cage vehicle. The original director Tarsem Singh said he couldn't make the movie he wanted with Cage in the lead. The latter dropped out not long after the former did.
- Father Hennessy was supposed to originally die when - hallucinating that he was getting drastically thinner - he would gorge himself desperately on food and choke.
- A lot of fans of the film (and comic) consider the editing out of Constantine's half-demon sex partner Ellie, based on the succubus Ellie from Hellblazer and played by Michelle Monaghan, to be a loss for the film. The reason given was that it would be harder to believe that Constantine was a bitter loner if he was sleeping with a gorgeous woman, even if she was evil.
- Chaz had more scenes in the original script that ended up cut along the way. As a result, he just sort of vanishes for a good portion of the film. Likewise an additional ending would show Chaz becoming an angel.
- Actor Allusion: "Danse Voudou" finds Chas in Louisiana investigating occult murders done with a blade. He even takes his Yellow Crown Cab Co. car with him.
- Blooper: In the final scene of the TV series pilot, the level of beer in John's glass changes from full to having a large sip taken out of it and back to full.
- California Doubling:
- The series was filmed primarily in Atlanta. Constantine, Chas, and Zed travel all over the United States, and at one point Mexico, to quell paranormal activity. However, three episodes take place in Atlanta proper; in particular, "A Feast of Friends" prominently features the Fernbank Museum and the Fox Theatre.
- The opening scenes in the pilot is supposed to take place in the Ravenscar Asylum in Northern England; however, the asylum has red, American-style exit signs instead than the green, "figure walking out a door" exit signs used outside the States. The asylum scenes were filmed on the campus of Berry College in northwest Georgia; the exterior scenes of Constantine's millhouse hideout were also shot on the Berry College campus.
- The Danza: If you squint. "Chas" is usually short for "Charles," and he's played by Charles Halford (although this Chas is actually short for Francis, not Charles).
- Executive Meddling: Due to broadcast restrictions, Constantine couldn't be shown smoking as much as he does in the comics.
- Fake American:
- New Orleans PD detective Jim Corrigan is played by Irish actor Emmett Scanlan.
- Liv was played by British actress Lucy Griffiths.
- Keep Circulating the Tapes: Averted, when it was released on DVD and Blu-Ray under the "Warner Archive" label as a made-to-order boxset.
- Name's the Same: The TV series was filmed in Atlanta, Georgia, and the show's star Matt Ryan shares his name with the starting quarterback of the Atlanta Falcons.
- Network to the Rescue: Zigg-zagged, after NBC cancelled the show CW allowed Constantine to guest-star on Arrow for (what was) only one episode only due to rights issues. When those got cleared they decided to bring back the show as an animated web series on CW Seed, which while not the full-fledged revival most fans were hoping for is better than nothing.
- Screwed by the Network: Placed in a very tough airing schedule despite doing fairly good numbers.
- The Wiki Rule: Perhaps in record time, the show acquired one. There's also the ''Arrowverse'' wiki since the show has been retroactively added to it.
- What Could Have Been
- Liv was of course intended to be a regular character. Producers changed their minds at the last minute and reshot the ending of the pilot to write her out. Word of God is that they didn't like the idea of a Na´ve Newcomer in the cast, worrying that Liv could easily turn into The Load.
- In early production, the TV series was supposed to have Constantine based in New York City, as promotional materials have Midtown Manhattan in the background, and the Ravenscar Asylum also in the States; however, the final product had Constantine based in Atlanta and Ravenscar back in Northern England.
- The writers have revealed some of the things they wanted to do for season 2- namely, Papa Midnite would become a regular and among other characters, The Spectre would be brought in. There would also be a Bottle Episode inside the house.
- "Rage of Caliban" was intended to be the second episode. They later added the scene where Chas explains that Zed is in art class.
- Doctor Thirteen and Judith were originally going to appear in Season 1, before the season was ultimately shortened from 16 to 13 episodes.
- Before said cancellation, there were plans for Stephen Amell to guest star on the show as Oliver Queen, linking Constantine to the rest of the Arrowverse. Once the show got cancelled, the crossover altered so Matt Ryan would appear as John Constantine himself over on Arrow.