I've had this glitch a couple times. I have a power up at the beginning of a board where it changes all of one color to whatever color the power up is (ie reds to cyan, yellow to red etc), however some of the pieces that change color have changed, and then changed again. So they'll change from orange to red, but then a couple pieces that changed to red will suddenly change again to green (or whatever color). It doesn't happen every time, but it has happened a handful of times, maybe 10 or 12 times in the last couple of months.
The other glitch was today when playing the bonus board. Misty received her 15 pieces, built up to send out the power up and nothing came out... I know nothing came out because all the pieces on the screen were still just regular pieces - no fish, stripes, wrapped etc. This was a first for me.