So aside from the additional kiss scene, I think there's no other interesting stuff for the DVD/BD version.
Hikari kiss scene removes the original scene where she leaned on Kazuya's shoulder though. After Kazuya put her hand on his pocket and she said it's warm, they kiss and the scene changed to the boat date.
While for Aki, her kiss scene happened after she asked Kazuya to hug her, before Kazuya said everything will be allright and she will ace the real national exam.
By the way, weeks ago RAW files from some manga adaptations were out, including Photo Kano Memorial Pictures which is the adaptation of Ohtani Momoko route (ie. the big boobs teacher) that anime didn't do.