This might sound like a first-world issue, but....
When multiple new series concurrently as episodes are released once per week - It's hard to remember the number of the episode you last watched.
It would be a lot more convenient if you guys could figure out a way to indicate if we've already watched an episode without us starting it first. When we start the episode it will say "continue watching" so we know we already saw it, but it would be way more convenient if the episode number were a different color or something in the drop-down list.