Sim tray slighttly misaligned + a tiny rubber part left out

Hi There!

Along the iFixit guide I disassebled an iPhone 4, then put the device together again and it works fine. There are two things that I noticed after it:

1) The sim tray is somehow misaligned, and I remember it was hard to position the logic board back into place and maybe that is why the sim tray is misled by it just a tiny bit. Although I havent tried it yet with a sim card, because I don"t have the micro one at how right now. Any thoughts on that? (see attached photo)

2) At the very and of the reassembling process a little rubber part left out of the phone and I got curious where this little piece can fit (see attached photo). I suggest it is not so healthy to left something out long-term, but it is working though.

Thanks for all the help!