Right before there would be a dialogue option, the beginning of a voice clip from one of the choices would play before cutting off and playing the appropriate voice clip. Also skipping through dialogue would sometimes produce a strange noise.

In the sentence forming sections, clicking on one of the bottom row subject icons without placing it into one of the sentence slots would produce a bug where the given icon becomes unselectable. The only way to fix is to restart, otherwise you can't continue if the icon is one of the correct options.