At current, the blueberry events appear to be essentially bonus content, given their hidden and optional manner. While it might be possible they have implications later in the game, they don't currently do anything beyond themselves, even when eaten in the villain route through the game. Further evidence for the "bonus" nature of these events is the delay for the blueberry area in the factory, in favor of making the Seal of Water a priority for the dev (See Dev Update!, listed above). It's too early to say for certain though.