I recently read the seasons page for Black and White, and I happened to notice that something is missing.
With each season, the music in some of the routes (such as Route 3, where the Day Care is) change very slightly. Example: In spring, there is a flute playing, and in the winter, there are chimes playing in replacement of the flute.
Just thought I'd bring it up. :)
Here's the web page: http://pokemondb.net/black-white/seasons