Super Robot Wars Original Generation: Dark Prisonnote Occurs simultaneously with, but ends shortly after the last scenario of the Second Original Generation
Project X Zonenote Set sometime post-Second Original Generation due to the inclusion of Sanger Zonvolt and his references to those events in Project X Zone
Masou Kishin: The Lord of Elemental Part 2 (Nintendo DS/PlayStation PortableUpdated Re-release)note Part 2 cannot occur between the EX scenarios and the Elemental Lords returning to the surface world in the Second Original Generation, as Word of God states the secret Elemental Lords' attacks are only present as an unlockable treat to players, which should not occur until later
Super Robot Wars Original Generation: The Moon Dwellersnote Occurs post-Coffin of the End; explicitly referenced due to the Cybuster losing its connection to Cyfis, which happens in the finale for Coffin of the End
In Real Life, the mechanical design of the Wildschwein is based off of an early mechanical design for the Huckebein. This is referenced In-Universe, as the Huckebein line is developed directly from the Wildschwein.
"Rampage Ghost" can be used with the Rein Weiss Ritter for the first time in Original Generation 2. In Super Robot Wars Impact, players have an choice of either reverting the Rein to normal or keep it as it is but lose the Shin Getter Robo; doing the latter, however, gains Rampage Ghost for the normal Weiss Ritter and Alt Eisen Riese, something Original Generation doesn't have.
The key differences between the "Shadow-Mirror" dimension and the Original Generation universe are as follows:
The "Elpis Incident" kills off the entire Branstein family. Fortunately, the youngest son Raidiese survives; however, he dies during the "Vanishing Trooper Incident". This event also makes it taboo among mechanical designers to ever manufacture another "Personal Trooper" resembling a Huckebein, which explains the proliferation of Gespensts within the Shadow-Mirror.
The "Aerogaters" do not arrive after the "Divine Crusaders War": it's the "Inspectors". Similarly, Meteor-3 does not crash on the Earth; it's implied the radioactive mineral "Tronium" used to power the SRX is brought to Earth rather than being found within the meteor.
Excellen Browning dies in the shuttle crash. Her parents take her body and resuscitate her through science and technology, rendering her into Lemon Browning. Likewise, Sanger is killed-in-action: his body is taken by the Shadow-Mirror and rebuilt into the W-Numbers W-15 "Wodan Ymir". It's implied the "Einst", instead of Excellen, targets Kyosuke Nanbu, creating the destructive "Beowulf".
For Alpha Gaiden and this installment, Shu Shirakawa is the True Final Boss. However, he blatantly states he serves "Shiva Volkruss" for this game instead of referring to it as "a being" for Alpha Gaiden. Meanwhile, the final battle against him in Original Generation Gaiden is more of a parallel to the same one from Super Robot Wars 3 than Alpha Gaiden by summoning several automated Valsion units, with the title of the scenario being called "Armageddon", the same one from 3.
Back-story in Super Robot Wars Compact 3 loosely mentions another Heaven-class Shura God in the Swordian Fortress. It still remains in slumber by the end of the game.
The Second Original Generation
Back in Super Robot Wars EX, playing Masaki's route will lead to him and his allies encountering the Elemental Lord Zamzeed under control of the Shutendonias Alliance, with vague mentions that Tytti Noorbuck has a history with the machine. It isn't until The Lord of Elemental is released this Plot Hole is resolved; as Late-Arrival Spoiler is in play for this game regarding Masou Kishin, Tytti explicitly tells the surface dwellers the Zamzeed was previously used by their posthumous comradeRicardo Silvera. The game also highlights Tytti's conflicting emotions when Mio Sasuga is chosen to be Ricardo's successor.
Back in Super Hero Sakusen ("Super Hero Operations"), Euzeth used the power of Ultraman to create the "Chojin Zest", an Expy of Evil Tiga. In the Second Original Generation, he does the same, but with the Nashim Gan Eden instead of Ultraman, creating the "Adamatron".
It's explicitly stated the "Zuvorg Alliance" haven't directly fought the "Ze Balmary Empire". It's suggested the Zuvorg had scuffles on the edges of their systems with the Balmar's "Neviim" lunar satellites and their automated legions and such, referring to those things as the "wandering Balmar".
The Medius Locus stops evolving after it reaches its second form because it absorbs Albero into its Lasmunanium; the machine is discarded afterwards. Instead, its replacement is the Model-X "Garberus", previously hinted at in MX and the intended final prototype of the "Tsentr Project".
Rather than use the "the Star of La-Mu" in MX, Eldy Mitte uses the Cross Gate in the Fabula Fores beneath Antarctica to power up the "AI-1". Duvan Org also attempts it, but the Alles Geist can't handle its power. Since Eldy is simply using Duvan to buy time, the AI-1 absorbs Duvan and the Alles, turning into its final form from MX.
In general, the "Gaia Sabers" don't seem to really mind what Eldy is doing throughout the game (until it turns out Euzeth was counting on her to complete the AI-1 all along), and General Mitall Zapad was openly trying to stop her from working on it. Like MX, Eldy eventually kills Mitall for interferring with her plans.
The dialogue during the "Elyon Yada Domar" attack of the Adamatron mentions the following, with an appropriate silhouette(s):
"This is the Black Hell" note Euzeth's Black Judecca
"This is the Black Angel" note Astranagant
"This is the Black Gun God" note Dis Astranagant
"These are your ancient forebearers" note Nashim Gan Eden and Gebel Gan Eden
The Moon Dwellers
In Super Robot Wars Judgment, the "Fury" state they were locked in a previous war with another faction to determine the fate of the Earth. In The Moon Dwellers, this mysterious faction are Perfectio and the Ruina, whom the Fury sealed with the "Fabula Fores" in the Antarctic. The "Granteed" constructed by the Fury serves as a countermeasure in the event Perfectio returns.
Building off the above, the "Sympathia System" used in the DestinyHumongous Mecha are replicas of the Fury's "Cytron Control System", first hinted at when Joshua Radcliffe is using his "Geant Chevalier" and it resonates with the Granteed; this is later confirmed.
In the first episode, aside from the SRX Beowulf destroys, two other machines are seen. According to Word of God, they are the Grungust and the Wildraubtier.
The Huckebeins being Exiled from Continuity in Divine Wars is continued to the point of self-parody: Bullet's intended Huckebein MK II and its mass-produced variants are replaced by a mass-produced Wildschwein (a mech that also resembles a Gundam, though not as much as the Huckebein). Likewise, the "GuarBein" MK III Trombe belonging to Ratsel Feinschmecker in episode nine is a mish-mash of the Huckebein MK III and his old Guarlion Custom, while Ryoto Hikawa gets the EXbein, the In-Universe prototype of the MK III.
The Leitmotif "Fairy Dang-Sing" heard in episode ten is the first time since Alpha a character's theme song is given official lyrics. Current SRW series producer Takanobu Terada wrote the lyrics, with the voice actresses for Latooni Subbota and Shine Hausen singing it.
In episode nineteen, the voices of the RyuOhKi and KoOhKi are Masami Obari and Terada, respectively. This marks the first time the Choukijin are voiced.
Actor Allusion: Of sorts; the voice actor for Russel Bagman has no other roles because his primary job is "director photographer". In other words, he's the one in charge of the background.
Ascended Fanon: Latooni and use of the Wildraubtier. Original Generation isn't demanding in terms of "mandating" players to put which character in whichever unit; due to her lack of plot focus, the game allows Latooni to be in any mecha without protest. However, savvy players will put two-and-two together and place her in the Wildraubtier the instant Ryusei Date is done with it, due to it matching her high evasion stat and ranged combat style perfectly. This didn't go unnoticed by the developers, and in Original Generations, the switch becomes mandatory. Even when she isn't using the Fairlion, the Wildraubtier remains her default unit. Made more obvious when the Wildraubtier "Schnabel" is personally fine-tuned In-Universe by Latooni herself before the events of the Second Original Generation.
Meta-example - Lenonjayce Stallord and Patricia Hackman may have created some of the Gespenst's more famous attacks, but before Original Generation was released, the machine was largely forgotten by SRW players. When Kai Kitamura makes his debut in the games, who demonstrates why the Gespenst isn't a simple Mook unit, fan reception to the mech, largely due to Kai's Memetic Badassery with the machine, gave it a well-deserved bump back up on par with other units like the SRX and Dygenguard. By the Second Original Generation, the Gespenst is as easily recognizable as some of players' favorite units throughout the franchise.
Irony ensues In-Universe: The Federation originally intended to scrap the Gespenst in favor of the cost-efficient, mass-produced Huckebein until Kai takes this further by designing a customized, mass-produced Gespenst MK II in Original Generation Gaiden on his own (with some internal support from Gilliam Yeager) and promoting its benefits to the higher-ups. By the Second Original Generation, these Gespenst MK II Custom units are used widely by the military over the Huckebein.
Played with regarding Beowulf: fans deduced he was associated with the Einsts via Facial Markings under his eyes in his character portrait for Original Generations, similar to Einst Alfimi. The Endless Frontier drama CD doesn't explain why Beowulf's Gespenst MK III could regenerate a lost limb after Axel uses the Soulgain to destroy it, further fueling the speculation he is tied to the Eldritch Abominations. The first five minutes of The Inspectors confirms this, but its validity in the games' Continuity has not been established yet.
When the Nashim Gan Eden fires a Wave Motion Gun towards the moon just as the Final Boss scenario is underway in the Second Original Generation, many players believed this event was simply ForeshadowingJudgment getting into Original Generation as the villainous Fury reside deep within the moon; even Elma makes a quip about this in Dark Prison, citing the blast "did not hit any man-made structures". Sure enough, they serve as the headlining antagonists in The Moon Dwellers.
The plan to include Arteil Steinbeck was around since the developers were drawing up the story for the first Original Generation game. The writers even thought about adding him to Divine Wars, Original Generations and The Inspectors. Instead, Steinbeck is briefly mentioned in Original Generation Gaiden before appearing in-character for the Second Original Generation.
According to the animated staff for The Inspectors, in episode ten, the Super Robot "Gravilion" used by Archibald Grims was originally going to be in the first game as an enemy unit for the Divine Crusaders, but this was dropped during development. Eventually, the developers decided to bring it into The Inspectors to showcase the Neo Divine Crusaders having access to exotic, Super Robots other than the Valsion Custom in Divine Wars.
Due to the ending of Coffin of the End, Masaki was going to pilot the "Duraxyll" in his return for The Moon Dwellers. The idea was later scrapped and he continues to use the Cybuster albeit under story-specific conditions.
By Word of God, Sakito Asagi is from the island of Hokkaido and goes to the same school as Touya and the Akatsuki twins, even being one of their friends. This indicates Sakito was supposed to appear in The Moon Dwellers, but the developers decided not to include him; in fact, a Lampshade is hung with regards to Foreshadowing Sakito's integration in future installments - if players have Masaki in the Cybuster fight against the Lamalice Mooks, one of his Familiars Shiro will mention Sakito by name, stating they should have brought him along.