You can safely ignore this if you are starting a new game. However, a lot of data got moved around 
in this update, so if you plan on continuing on, there are some things you need to keep in mind. 
All of this is also in 1.5 Changes.txt, but I wanted to make sure to highlight it:

1. I moved the Options menu around a fair bit, so that the "set" battle style is default, and 
everything looks nice and pretty. Ergo, please CHOOSE THE LEFTMOST OPTION FOR EVERYTHING, save, 
and then apply the new patch and go from there. Otherwise, the cursors will be messed up, and 
since cursor position tells the game what option you chose, this could cause many issues.

2. Due to moving around all sorts of data, a save may spawn you into a Glitch City, or put you in 
one after going outside of a building. To get around this, all you need to do is use Fly or 
Teleport, or use the Gameshark code 011671D3 to be able to Dig/Escape Rope from anywhere and 
do so. Please note that this is NOT the code listed for this function on various websites, due to 
the change in Bag size.