Referenced by.: In Chapter 2 of Deltarune, one of Mauswheel's battle quotes reads '(Rolling around at the speed of mouse.)', riffing on the opening line to 'Escape from the City'.

For most of the game, David Humphrey voices Shadow, Ryan Drummond took over for a few lines during the Final Boss due to the former being unavailable at that point.

Ditto for his Japanese voice from Kazuki Hayashi-to-Atsuki Murata.

Tails, who was voiced by Corey Bringas in the first game, is now played by Corey's younger brother, Connor.

This strange decision results in a separate problem for White Jungle (see Unintentionally Unwinnable). Loading Green Forest's map with White Jungle's object placement lets you play this removed version of Green Forest (albeit very incompletely as the terrain itself was different in the prototype layout, resulting in missing traversal objects that leave you stranded at certain points in the stage you'll need anti-gravity hacks to explore the entire prototype layout). Rather it was actually shoved into White Jungle's level data.

There is an entire level layout for Green Forest that was cut out of the game.well, sort of.

There is also unused dialogue for Shadow for multiple things, such as being grabbed by a ghost, which is impossible due to not having ghosts in his levels.

There is also some unused sound clips from Omachao.

Here are some unused sound clips from the game.

It is only accessible via hacking or, in the case of the Xbox 360 and PS3 versions, a glitch.

Dummied Out: The game contains a hidden level used by the developers for testing the game engine.

Sonic adventure 2 hacking