Earthbound Optimization Tricks

When entering Either fourside or Summers museum, it is faster to talk to the lady behind the counter rather than sneaking in (Credit to DanielRGT for the comparison)

Watch the comparison video

When exiting Dungeon Man, it is faster to skirt the top of the wall behind the sign rather than going around (Credit to ロリのヒモはいいぞ for the image)

Dungeon Man Exit

If you need another magic butterfly, you can force a new one to spawn by walking away from the area. The blue line in the image below marks how far you need to go to force another butterfly spawn. (Credit to Brooke for the tip and the image)

Butterfly Respawn