Froze coming off the Firehouse map? Uh-oh, didn't run into that one in testing. I'll have a look at it (and cross my fingers that the judges don't hit the same bug!) ...in fact I think it may have been a last-second attempt to fix a minor bug with the carolers that introduced the bug you hit! Argh! XD
If you have a chance to replay, I know that giving the gift to the carolers last (after you've handed in the toys and books) should work.
I'll double check the post office! I do know there was one in the library, so I wouldn't be surprised if I missed others XD
Thank you so much for giving my game a try! I hope you have a chance to see the end too!