These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Step Up
Call Back: Jason, from the Pirates crew, appears also in Step Up 4.
And of course Moose. Moose is the main secondary protagonist in Step Up 2. He does the same in Step Up 3 as Camille's romantic interest. And then Jason calls him so he can appear at the end of Step Up 4, because no one would recognize it as a Step Up movie anymore without the Ensemble Moose in it.
Cliché Storm: 3D's plot is every low-budged sports/competition convention thrown in, complete with the two rival team's lead dancers being former friends that had a falling out.
Fanon: Camille's relation to Tyler is not concrete. At most the two are half-siblings because she mentions her dad being in prison, but fans decided that they were related and producers decided they agreed.
"Funny Aneurysm" Moment: Revolution features a scene of the heroes crashing the villain's party, where they throw in smoke bombs and then dance around while dressed completely in black with gas masks, to a song that includes gunshot sound effects. Even considering that this is plot-relevant, it's rather jaw-dropping that the studio didn't feel the need to remove this scene after the massacre at an Aurora, Colorado screening of The Dark Knight Rises.
Moral Event Horizon: Crossed in All In with the revelation that the dance tournament was rigged. Alexxa Brava especially went over with her being in cahoots with Grim Knight, who the producers were planning on crowning at the end before LMNtrix's show-stopping and spectacular performance forced them to change their minds, much to Alexxa's clear dismay.
They Wasted a Perfectly Good Plot: 3D features the return of Camille Gage, Tyler's sister. However this is never mentioned at all. They could have had her feel like she's in his shadow because he's a famous dancer. They also could have had some sort of flashback featuring the start of her friendship Moose or even started the movie with it before doing a flashforward