-When disabling music through the options menu (or loading a save game with disabled music), any sustained notes will keep playing before stopping. Re-enabling music will freeze the game for a little bit.
-Minor visual issues with "SLOW/STOP" display.
-Using freeze frame when in screen-scrolling pipes will make mario re-appear visually, though he'll be behind scenery. This is only really noticeable when going through small horizontal pipes.