You can see some exploration here:
Also :
- Yes, it has a world map (not explorable though), you have access to many levels and they're pretty big but it's not a true open world.
- Many towns like Gingertown, Satan City, West City, etc.
- RPG quests are in (after all, it's an Action-RPG). Not mindblowing stuff but you can encounter many Dragon Ball characters and there are funny stuff like finding sexy magazines for Muten Roshi. Yes, there is a quest with his turtle hiding the magazines.
- No Faulconer music (thankfully ha ha but I understand why some people like it), music from the japanese anime, mostly remixes.