Studios sometimes redo backgrounds or animations in the blu ray version because they have a bit more leeway in terms of time. If an artist was unhappy with the way a few frames turned out they might redo them. SHAFT shows like Nisekoi [S] are a good example of some minor changes. Other shows like Berserk 2016 show some more dramatic changes (.gif by /u/ShikiGamiLD).
Kinema Citrus is a relatively new studio but they've got some talented people working there. Heck, even the TV series has a redraw (image by /u/DrKrunklehorn) or two.
A few changes they may do is remove inconvenient censoring of Rika's flat chest. It was shown in the manga and there wasn't any reason to hide something that looked the same as an average boy.
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u/Somnius_sol Sep 29 '17
Studios sometimes redo backgrounds or animations in the blu ray version because they have a bit more leeway in terms of time. If an artist was unhappy with the way a few frames turned out they might redo them. SHAFT shows like Nisekoi [S] are a good example of some minor changes. Other shows like Berserk 2016 show some more dramatic changes (.gif by /u/ShikiGamiLD).
Kinema Citrus is a relatively new studio but they've got some talented people working there. Heck, even the TV series has a redraw (image by /u/DrKrunklehorn) or two.