The creators of Stranger Things have suggested rewatching certain episodes before season 5. There is some uncertainty about the exact number of episodes, with reports ranging from 4 to 5, but it appears that the creators have identified key episodes from seasons 1-4 that are essential to watch before the new season. The specific episodes to rewatch have not been universally agreed upon, but several outlets have reported that the creators recommend rewatching a handful of episodes to prepare for season 5.