Big Mining Drill resource drain scales with quality in a linear fashion, reducing drain by ~8% per level & 17% for legendary. This looks natural until you realize that what matters more is actually the inverse of this number, which effectively defines "ore patch longevity". And this number scales ...

In the Technology tab, when hovering over the repeatable technology icon to see its effect, the pop-up supposedly displays the increment, the current effect, and the effect after researching the technology. For example, with 4 levels of Refined Flammables researched, checking the effect of level 5 ...

For Tesla turret, Factoriopedia shows "Ammo Category: Tesla". This is incorrect, because the turret does not, in fact, use ammo. It confused me and caused me to ignore Tesla turrets since I thought the ammo would be too tedious to ship from Fulgora.

A similar issue exists with Flamethrowers turrets ...