Continuity mistake: When the lieutenant and the new guy that joined up in season 2 are in the hospital, he reaches for his gun, shoots, and...click. No ammo. The lady then pulls our her gun, slide fully retracted, finger not on the trigger and states "yeah, me too." Thing is - if the slide was already retracted from running out of ammo - wouldn't she already know? I mean, she holstered the pistol. More egregiously, every shot before this, her slide was not retracted, and the pistol was ready to fire, until now, when she suddenly has a retracted slide.
Question: In this episode, several teams of human "harvesters" wander through a greenhouse filled with vegetable-hybrid zombies, searching for specific seed pods that might cure the zombie virus. None of the harvesters survive very long inside the greenhouse, even though the translucent plastic/fiberglass greenhouse walls are never more than a few steps away. In fact, the prized "Batch 47" is discovered just feet away from the translucent wall. Why couldn't the harvesters escape from the zombies by simply charging straight through the flimsy greenhouse walls? Or, even better, why didn't they just tear out the flimsy walls from the outside and search for Batch 47 from around the perimeter? I mean, it's just a greenhouse, not Fort Knox.