There are a number of unintentional glitches in Anodyne. A glitch is defined as the game behaving in a way that is contrary to the apparent intention of the developers when the game was originally made. Although the developers of Anodyne were aware of several glitches when they released the final version of the game, the glitches were not designed deliberately.
A related topic is intentional code that appears to be unintentional, such as the graphical effect when Young is out of bounds. Despite looking like a glitch, the code was actually written intentionally, and so does not count as a glitch. Note, however that Parallel Universes are glitches.