Sonic the Hedgehog 2/Headscratchers

• Have you ever noticed that Sonic's journey from Emerald Hill to Hill Top takes two days?
  • Actually, you could extend this to every level.
    • Emerald Hill: Day
    • Chemical Plant: Night
    • Aquatic Ruin: Day
    • Casino Night: ... err, night.
    • Hill Top: Day
    • Mystic Cave: Underground, cannot determine. Could be night, though.
    • Oil Ocean: Day
    • Metropolis: Indoors, can't determine. Again, could be night, given what has been shown so far.
  • And after that, levels segue into each other smoothly, so it all happens during the day.
• Dr. Eggman's Eggmobile in Emerald Hill uses a helicopter rotor for flight. Certainly, there's only one reason for that.
• Concerning the 8-bit version: why do people assume Tails dies in the bad ending just because his constellation shows up? In the good ending you see both Sonic's and Tails's constellations, yet they're both clearly alive.
  • The difference is that when Tails and Sonic are seeing themselves in the sky, they see reflections of them together the way they would like to be. When Sonic sees Tails in the sky, Tails is nowhere to be seen, and Sonic is all alone while sad music plays. It's a conclusion made through the identifying factors during the ending and comparing the two together.
    • Even so, if he's alive and kicking with his constellation in the Good Ending, couldn't he be alive in the Bad Ending as well? Maybe he's just working for Robotnik now.
      • I guess it might be a case of Came Back Wrong or something? Like Sonic saved Tails, but Tails isn't the same, or the Tails he knew was changed somehow.