Hi!
As the title says, what happens if i get an address wrong? Do the coins get lost?
If that's what happens, why not change the code in Bitcoin, so that if the bitcoin network cant detect that address, returns the bitcoins to you?
Actually, if you sent bitcoins to other wallet then you just screwed up big time. Especially if it is a big amount of money, although if you know whom you just send to then you can communicate and ask to return the value that was transferred into his or her account. But it is hard to trace and determine who and where the user of the wallet is, because it is unique in every way.