Easter Eggs and Hidden Details in SHf.

Face

Not a very hidden eyes and tongue is visible on the back of Hinako's default outfit.

• Looks like a cat's face.

Fallen Bunny Ears

If you use the Pink Bunny outfit from the deluxe edition, in the cutscene after following the Fox Mask, Hinako's bunny ears are next to her instead of her head.

Sakuko's Shrine

While doing the second ending and during the "Head to Rinko's House" mission, if you go to Sakuko's shrine, you can see her in her boss fight form inside the shrine.

Congratulations (Evangelion)

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On your second play on a New Game+ play, if you go inside doctor's house in the rice field, you can hear people saying congratulations in a radio device.

• This is a reference to the congratulations scene in the Evangelion anime.