The galleries for "Childhood Enhanced" and "Ruined Childhood" followed suit, mostly because "Childhood Enhanced" would mostly be pictures of female characters in more sexual scenes.
The last half of the opening credits in the main series does this as well, cutting back and forth between scenes from the show, pictures of the major characters and jargon from the show written on stark white-on-black title cards.
Mami appearing in random pictures she wasn't really in during the montage at the end of Episode 3 is quite similar to a famous Tumblr blog called Rude Rapunzel, where a photo of a singing Rapunzel from Tangled appears in various scenes from Disney movies.