On the far side of the lake out of bounds is what looks to be a satellite with a golden plaque of some sort on it. In the full game, if you go near the church out of bounds in the game you can find a gravestone with a silhouette of the Neighbor's wife, Diane on it. Out of bounds in Alpha 1, there are duplicates of the player's and Neighbor's houses, both of which are used for the basement cutscene.
Out of bounds in Pre-Alpha, you can find a burning house on top of a hill. This can be found in BP_Sosed (the neighbor). When you open the cue, it shows audio files of extremely vulgar language. In the Mod Kit, you can find a part where it says Swear Sound.
