Factual error: Alice and Kate's little reunion underwater is disrupted by policemen that fire at them, and one of the shots reaches the transport truck, ignites it and makes it explode. The scene is baffling; forgetting the complete disregard for fellow policemen in the vehicle, how would bullets have enough strength to penetrate into an armored truck deep underwater, reach a critical weak point from that angle (the truck is upright, they should be barely get to shoot the roof of it) and still underwater cause inside the completely immersed vehicle a spark that would ignite fuel and make the whole truck explode? (00:31:45)
Factual error: Kate fires a grappling hook into the back of the runaway train - it punctures the thin back door easily. She then fires another one backwards which hooks against one of the sleepers on the tracks. The slack gets taken up...and the train jolts to a dead stop as the hooks bite, (with everyone just wobbling on their feet somehow). No way on earth that's possible - the back door would have been torn off/open like a tin can and/or the sleeper would have been yanked out out of the ground, and the train would have ploughed into the station at full speed. Not to mention the fact that only after the train stops does the sleeper apparently give up the ghost and break. The magical supermetal of the train door is somehow still intact.
Factual error: The villain drops the elevator full of waiters and catering staff; the display gives him no indication of whoever is in each elevator, but we can maybe assume it was a staff-only elevator and he knew it (it surely had no markings to indicate it). When Kate reaches the ground floor, everyone inside that elevator is lying unconscious in the corridor. I could understand if the survivors crawled there, but everyone is simply KO meters away from the elevator as if the impact happened there and not in the elevator shaft with a devastating buildup that had to be vertical and contained for obvious reasons. (00:29:30)
Factual error: The villain triggers the detonation that causes the elevator with Kate's dad and stepmom to start falling. After an initial hiccup, the cabin begins a freefall. Only after this real fall begins and the elevator already fell a few floors down, Batwoman lands on another elevator. Pauses. Shoots her rope to the top of the shaft. Hooks it. Pauses. Shoots from Chekhov's gun the double edged harpoon, which effortlessly sticks to the top of the elevator cabin and halts the ruinous fall with a smooth slowdown and no oscillation. All of that happening because somehow the elevator in all those seconds is just a handful of floors lower, even if it was plummeting at breakneck speed from the very first shot. (00:35:40)
Factual error: The very first shot of Kate and Reagan taking a walk in downtown Gotham for the lunch date is a wide-angle view. Several flags on the right side of the screen are visible, including the City of Chicago flag with its 4 red stars and the State of Illinois flag. (00:13:20)
Factual error: At the end of the episode, Batwoman shoots her Bat-rope at the villain and yanks her off the building she made her escape to. Magpie is not a superhuman invulnerable being; assuming the grapple didn't puncture anything in her flesh and just hooked to some part of the costume like her backpack, she still is pulled with force from well above the 5th floor of a building to the end of the street, back first into a fountain, with a water level so shallow that she backpaddles into it as soon as she lands without being submerged. She does not experience a single moment of shock or stun from an uncontrolled fall of that magnitude. (00:33:00)