There is an unused game over theme in the game's data that resembles the game over theme from Star Fox 64.
Most of the music heard throughout the game are tracks from Star Fox 64 redone in higher-quality. The one noticeable exception is the cover of Fortuna, which is a heavy orchestral remix of the original Fortuna theme from the original Star Fox. No Star Fox Adventures music was reused however, despite the Walled City returning, most likely due to a copyright for the original track held by ##Rare##.
The game was intended to be multiplayer oriented, and the ground missions of the game had a control scheme similar to the on-foot multiplayer mode in Star Fox 64.