Update: 7/25/2017 Unfortunately as of July 2017, only seasons 7-10 of Futurama are on Netflix now. This often happens when shows are badly out of order, and that’s why we sometimes suggest not reporting order issues to Netflix, because rather than fix it, sometimes they make it disappear. It’s not on Hulu, so the only way to watch is to buy it on Amazon – Season 3 here.
As you can see, starting Season 3 there are a lot more out of order episodes. While you can watch it in the posted order, there are some internal references that won’t work, and fortunately all of the episodes are available. Be careful about what Season it says, these episodes are across Season 3, Season 4, and even some in Season 5 (as listed by Netflix).
S3E5 = Season 3, Episode 5