In a interview with Collider in November 2014, Guillermo del Toro talked about setting the stage for Pacific Rim 2 (2017), stating, "It's a few years after the first one. It's not an immediate follow-up. It is the world having been freed of Kaiju, what happens to the world after -- what happens to the Jaeger technology once the Kaiju are not a threat. It's quite a jump." del Toro did not return to direct Pacific Rim: Uprising (2018).
During an interview with Collider in November 2014, Guillermo del Toro stated that Charlie Day's character, Dr. Newton Geiszler, and Burn Gorman's character, Gottlieb, are in the sequel with the respective actors (Day and Gorman) reprising their roles from Pacific Rim (2013) for the sequel. del Toro commented on it, stating, "Yes. It's quite a different movie from the first one in that, but I think that two of our main characters like in the first one are Burn and Charlie. They are really, really -- I mean, honestly, they are probably the guys I have the most fun writing, along with Hannibal Chau, so just from a purely selfish drive, I like writing them. I love writing for Charlie and Burn. I mean, [Hunnam] in Crimson Peak (2015) for that reason, because I love working with him."
Warner Bros. Pictures, who produced the first film with Legendary Pictures until 2014, released this film internationally. Universal, who collaborated with Legendary currently, distributed the film domestically.
James Gunn filmed a cameo as a DJ, but it ended up being deleted from the finished movie. Gunn joked on Twitter that the scene was omitted so that his character could be saved for his own spin-off movie.
The conscripted scavenger character, Amana Namani, played by actress Cailee Spaeny, innovatively pilots her self-made Jaeger, that has the call sign "Scrapper," a term very aptly used from orthodox western boxing, which describes a fighter that is small in stature but has strong willpower. These attributes are frequently shown or referenced during the movie.
Of the four Mark-6 Jaegers, Titan Redeemer is the only one to not participate in the fight against Raijin, Hakuja, and Shrikethorn due to it being destroyed during the kaiju controlled jaegers attack on the shatterdome.
Despite being heavily advertised in the trailers, Obsidian Fury only appears in two scenes. In Sydney where it kills Mako and fights Gipsy Avenger, forced to retreat after other jaegers were about to be deployed, and in Siberia where it destroys an old jaeger factory, fights with Gipsy Avenger again, and gets it's power core ripped out in the end.
The giant kaiju made of the several smaller ones resembles Slattern the Category 5 from Pacific Rim (2013). They were the biggest kaijus in their movies, they used their tails to damage Jaegers, (Slattern used them to hit Striker Eureka's chest and to stab Gipsy Danger's back while the giant kaiju used them to rip off the legs of Saber Athena and throw it into a building.) and they used their environment to damage Jaegers. (Slattern shoved Striker Eureka into massive sea rocks while the giant kaiju shoved Guardian Bravo into several skyscrapers.)
For Gispy Avenger's Chain Sword, unlike Gispy Danger, in the first film, who was able to activate 2 Chain Swords, Gipsy Avenger, on the other hand, appears to only have one and can only be available to activate on the jeager's left arm.
In the film, a jeager named November Ajax sent to arrest Amana and Jake for an unregistered jeager, who are escaping in Amana's homemade Jaeger 'Scrapper' but happens to be the one and only time we can see November Ajax in the film.