@PJSim, if you are seeing the green arrows on your walls while in live mode, then you must have just been in build mode. It's just another one of the quirks of the game that if you go from build mode straight back to live mode the arrows stay around.
So before going back to live mode you need to go to buy mode then back to live mode when playing your game.
The arrows are annoying when you are taking pics, so if they bug you then that's how to get rid of them...
Nice meteor pic, I know people have talked about if Sims can die by a meteor dropping on them, would be nice to know if that is true or not!