The opening credits is set to an orchestral remix of the theme song of the 2003 series.
Another orchestral cover of the theme plays during the climactic arrival of the Teen Titans of Infinite Earths.
Character Rerailment: As with the previous movie, the 2013 Titans in general show more effort to save the world than usual, likely due to the presence of their 2003 counterparts. In particular, the two female Titans do not act as their usual flanderized, jokey selves.
Starfire is once again The Heart of the group, disregarding the more negative aspects she developed over the series.
Raven doesn't act as goofy as usual, taking the threat of the two Trigons seriously.
Genius Bonus: After eating all the alternate Ravens, 2013 Raven becomes a One-Winged Angel called "The Unkindness". A group of ravens is, in fact, called an "unkindness".
Harsher in Hindsight: The jokes about the DC Animated Movie Universe being edgy, as well as 2013 Robin attempting to join that universe's Titans by replacing Nightwing takes on a darker tone considering the team's fate in Justice League Dark: Apokolips War, where Nightwing was killed, resurrected by the Lazarus Pit and driven insane as a result; Starfire was killed and turned into a cyborg; Cyborg himself was dismembered, fused to Apokolips, and had to die to take out Darkseid and Trigon; Beast Boy was killed; and Raven, though physically okay, contemplates suicide twice.
Hilarious in Hindsight: The scene with all the alternate Titans teams arriving through portals to battle Hexagon looks like an unintentional parody of the Avengers:Endgame scene where all the restored heroes arrive through portals to battle Thanos.
Moment of Awesome: The battle between the two teams does have some awesome moments:
2013 Beast Boy eliminates his other-self by transforming into a kitten which 2003 Beast Boy cannot bear to harm. And when the latter transforms back into a human, 2013 Beast Boy crushes him as a whale.
The thumb war between the two Starfires.
The Ravens' fusion, a giant, shadowy raven-esque dragon appropriately named after a flock of ravens, "The Unkindness".
The arrival of dozens of alternate teams of Teen Titans from parallel earths to fight Hexagon, complete with an orchestral version of the original 2003 series's theme song.
2013 Trigon eating 2003 Trigon after taking his abuse for too long. He may be a Lighter and Softer version of Trigon, but he's still Trigon.
Shallow Parody: The film pokes fun at how self-serious the 2003 show was, with Robin having to make a brooding Inner Monologue before every fight and Cyborg angsting over his robot body...Only the characters almost never did that in the original series and in fact, put audiences off with how laid-back they all were in comparison to the rest of the DC Animated Universe.
In the "We are Titans" song Beast Boy mentioned his Terra died. Apparently the writers of the movie never saw the last episode of the 2003 cartoon.
Tainted by the Preview: Fans of the 2003 Teen Titans became mad that, after Tara Strongtweeted that a sixth season of the original show could happen if Teen Titans Go! To the Movies was successful enough (it wasn't, with Warner Bros. demanding that the flick gross at least $250 million at the box office to even consider green-lighting the sixth season; it only pulled $52 million worldwide), this seemed to be all the follow-up we were getting on that promise. However, film director Jeff Medinkow in a SDCC 2019 interview stated that if the home media sales are good, there's a decent chance that the series could be revived for a sixth season. It should also be noted the movie entered production roughly around the same time as the first TTG movie.
Take That, Scrappy!: 2013 Robin, frequently cited as the most hated aspect of Go!, is repeatedly kicked in the face by 2003 Robin and is the first to get taken out during the fight between the two teams. Though he does earn his 2003 counterpart's respect, just not the way he wanted.
that a sixth season of the original show could happen if Teen Titans Go! To the Movies was successful enough (it wasn't, with Warner Bros. demanding that the flick gross at least $250 million at the box office to even consider green-lighting the sixth season; it only pulled $52 million worldwide), this seemed to be all the follow-up we were getting on that promise. However, film director Jeff Medinkow in a SDCC 2019 interview stated that if the home media sales are good, there's a decent chance that the series could be revived for a sixth season. It should also be noted the movie entered production roughly around the same time as the first TTG movie.