Nobody says that "Back to 1942" is the subject just because it is at the beginning of the sentence. I thought all people know that in chinese, especially in above context the verb '放' is a vt instead of a vi, and in this sentence, "Back to 1942" is the only eligible formal object or say subject overthere, as expected. On the opposite, if "Back to 1942" is deemed the adverb, then the vt '放' without its formal object(subject of the sentence) causes a grammar error undoubtedly.