none. it's just the look. if you want better earnings and exp try leveling up your dishes. you can do that in the Academy found on the far left of the market.

try selecting each part of the wall until you get the destroy option. the hammer icon, that is.

you don't. it's random.

lucky you! the game crashes every time i do that.

aside from what you've said I guess the only way left for you is just buy the boxes with diamonds.

reach lvl17 and build it for 10k coins