Fix Minor Bugs in Sonic 2
From Sonic Retro
(Fixes by Shadow05) This guide focuses on bugs too minor for their own pages.
DEZ music not playing after Mecha Sonic
At loc_39BA4, you'll see these lines.
move.b (Level_Music).w,d0 jsrto (PlayMusic).l, JmpTo5_PlayMusic
Change the move.b to a move.w.
Because the game is reading it as a byte, all it does it try to play Sound $00, as $00 is blank, nothing happens.