The heart is your reminder
Tap the heart on a poster or use Save to My List on a title page. The saved state follows that production through search and catalog pages in the same browser. Tap it again when you no longer want the reminder.
A saved series is not a checkpoint
You may save Power before starting it. Later, after finishing an episode, choose the season and episode on its title page and save a checkpoint. My List shows both your saved choices and recorded checkpoints, so you do not need to keep the position in a separate note.
No password to recover
There is no PubFilmz account behind this local list. That keeps the interaction simple, but it means another browser will not automatically know your choices. Private browsing, cleared site data or a different browser profile can leave you looking at an empty list.
Before changing devices, use Create backup. Keep the full text somewhere you control. Restoring merges recognized titles into the receiving list rather than requiring you to choose between the old list and the new one.