Some of the puns near the end are ink-onceivable.
Nintendo has posted an Iwata Asks article for Splatoon ahead of the game's release.
Satoru Iwata sat down with five members of the Splatoon development team to discuss the game's development. The article mentions how the game's director Yusuke Amano designed the E3 reveal trailer from the ground up in order to ensure the vision came directly from the team, and the game originally played with the map on the TV and all action on the GamePad.
Perhaps to the shock of many, the team didn't notice the similarities with Super Mario Sunshine until late in development:
We only remembered it later on. Like, "Oh yeah, there was a water gun in Super Mario Sunshine." As Nintendo employees, that’s pretty embarrassing. (laughs) - Hisashi Nogami
The full six-part interview can be read here.