Like how if your starter is shiny it will have the shiny animation but the colour will be the same, and how trainers can see you and battle you when looking in the wrong direction sometimes.
Also, are any glitches in the demo harmful to the ds and any other games you have on that ds, and are the glitches harmful to the demo?
Here we go:
That's all I could find so far, other than a few graphic glitches but they're of no harm. Also NO glitches whatsoever can harm your ds, your ds just record's them the same as game data.