GLITCHES ARE REALLY BAD!
(most of the time)
When you have thirty newtgats in one area, surrounded by walls, they will get stuck in the walls and escape.
There is a Ruffian stuck outside the garden, will not disappear after turning game off and will not come in garden.
If a Mousemallow and a Syrupent are fighting, if you hit the Mousemallow with the shovel at the right time, the Mousemallow will be frozen in time.
There is a Trouble in paradise glitch where you can clone. There are good, and bad glitches.