This episode might be full of rather slow-paced flashbacks. But as a viewer who has been following this show for a long time instead of binging it all at once, i find it hard to recall all the details and story back in Season 1 when Sam Keating was still around.
Hence this episode is necessary to help us recall the strained relationships between the Keatings, bonnie and Frank.
Hence this episode is necessary to help us recall the strained relationships between the Keatings, bonnie and Frank.