The dancers are both references to Japanese anime and manga:
P1 is a robot who alludes to Gundam and Tokusatsu Robots. The dancer has a large robot arm on his right hand, as well as a red helmet, black chestpiece, and black and red legpieces.
P2 looks similar to Rei Ayanami from Neon Genesis Evangelion.
She has cyan hair, a head piece similar to cat ears, and a yellow Plugsuit with red caps at the joints.
The background is set in a futuristic city with sky-high buildings, comic billboards, and a typical Anime-style secret base.
There are 2 Gold Moves for each coach in this routine: Gold Move 1: Move your arms front to back for both coaches at the start of the first chorus. Gold Move 2: P1, lift your arms as if to flex your muscles. P2, point to the floor using your right arm whilst putting your left hand on your hips and putting your right leg in front of your left leg. This is the final move of the routine.
Nitro Bot is the second song by Sentai Express, after Spectronizer. Out of the two songs, however, Nitro Bot is mainly instrumental with some English vocals while Spectronizer is performed in Japanese.
The four dancers from Spectronizer make a cameo appearance on the electric billboards in the background.
Both Spectronizer and Nitro Bot appear in a total of four games each.
The signs contain Japanese words, which are アイス (ice-cream), and 万物 (an old-fashioned word for "everything").
On the Xbox 360, Xbox One, and PlayStation 4 (camera) versions of Just Dance 2014, on the first Gold Move, the score will present "YEAH!" or "X" twice, but it will not be worth more points. This was fixed in later games.
Ironically, despite having a Japanese theme, Nitro Bot does not make an appearance in Just Dance Wii U.
This is the second time in the series in which a song makes a comeback on a main game, but not as a DLC. The other time was Movement is Happiness (Find Your Thing), but that's only the case in the PAL region.