I don't know if this has been mentioned here or not:
A couple of changes that surprised me
-Timed Events
-Anonymous Phonecall (A phonecall, except u get a scenary picture instead of the girl's photo and the photo changes to the girl when u respond)
-Special Kiss Event (An extra 3rd ending)
-Confession Scene Stealing (Akicha actually stole me from Yui's confession scene during the title screen, the screen stopped before the title loaded and Akicha instead showed up and told me not to go and asked me to go with her, which resulted in Akicha's confession scene and the kiss event option)