There are 4 different sets of dialogue that the Black Queen and Professor T. Bird will speak in the ending cutscene. These sets of dialogue are selected at random.

In a few levels, there are enemies that can steal health by grabbing the energy bars from the health meter directly, as opposed to attacking the player's character. According to the game manual, these enemies are called 'Vaders, "survivors of the original invaders", referencing the game Space Invaders.