Slone is talking to Sydney in the ice cave asking her if she remembers going to live with him and Emily when she was younger and she says she does. Sydney says in season 1 that she didn't meet Slone until she started working at SD-6.
A scene, set on Monte Subasio, in Umbria (Italy), shows a typical landscape of a glacier, although there is no glacier on Monte Subasio and it is only 1290 meters high. Even in the coldest winter, there should be just fresh snow.