Board Thread:General Discussion/@comment-5808856-20150312001702/@comment-5307840-20160216070606

Bill in a sense didn't die, he was erased from the dimension meaning that his existence in that dimension has been removed specifically from that dimension. At best I can say that he returned to his original plain of existence.

Stanley losing his memory then regaining it most likely reflects the idea that Bill can return just like Stanley's memories.