Flashforward were alluded to with the funeral parlor Hoffs/Drawlar anagram in S3E22. In S6 in LOST, the flashsideways were an alternate reality (created because of the paradox when jughead went off)….that is evident by the running theme of reflections throughout most of the eps…..mirrors, window panes, etc. The flashforwards started when we see Jack and Kate at the airport and Jack delivers the now famous line “We have to go back!”
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