At time-stamp 33:45, in the subway scene where Ellie and Dina are taking cover, Dina silently counts on her fingers. When she reaches four, she has her thumb tucked in, while keeping the other fingers-including her pinkie-extended. However, when she reaches five, the last finger she extends is her pinkie, when it should have been her thumb.
In the subway, Ellie and Dina fire off a large amount of rounds from semi-automatic pistols at the infected without ever reloading.
When Ellie and Dina are laying on the floor Dina's arm goes from above her head to next to her face to under her head between shots but you never see her move it.
Ellie drags an armchair to barricade the door. When she makes it to the door she is using an office chair instead of the armchair.
When Dina and Ellie flee the station and go outside the closeup shot Dina's gun shows she has it loaded, yet she had just fired it at infected and never pulled the hammer back to reset it in that short time frame.
A character refers to "the metro station," which is not what they are called in Seattle. Even if the character was newer to the area, signage is visible on the train cars shown, accurate to modern day Seattle with the same 'Link Light Rail' logo used in reality. In addition, the apocalypse happened in 2003 and the Capitol Hill station did not open until 2016. The next nearest station is not close enough for the characters to run to in so short a time.
The compensators installed on the rifles of some of the FEDRA soldiers, including Sergeant Dixon, are installed incorrectly. A compensator is a device attached to the muzzle of a firearm to help control muzzle jump from the recoil of the weapon, especially rapid fire automatic rifles like the M4 carbines they are carrying. Compensators have slots in them to allow the gases being discharged from the barrel to be directed in a specific direction, the slots are supposed to be facing up so the force of the gas exiting them pushes down on the barrel, thereby canceling out the force of the muzzle jump recoil. However some of their compensators are on upside down, the slots are facing down which would have the direct opposite effect, the force of the gases being directed down would send the muzzle up making shooting accurately extremely difficult.
Some of the FEDRA soldiers have muzzle devices that don't have any slots in them, meaning they aren't muzzle breaks, flash suppressors or compensators, the only reason this type of function-less muzzle device exists in real life is to make state compliant AR style rifles have the minimum barrel length required by states with assault weapon restrictions that also ban compensators & other muzzle devices, there would be no point using them in a post apocalypse world. A soldier using an automatic rifle like the M4 would want a functional muzzle device to help with the high amount of muzzle jump a full auto has.
When Dina is listening to how many infected are in the train tunnel, she puts up 4 fingers to count 4 of them, with her thumb still back. when the camera cuts back to her and she counts the fifth one, her thumb is out and she puts her pinkie out instead to count the fifth one, even though she already put her pinkie up to count the fourth one.
Capitol Hill is a real neighborhood in Seattle, but the signage and geography bear no resemblance to the real neighborhood or city. In a previous episode, a character was seen at the top of the Space Needle, but in this episode the Space Needle is never seen, despite characters looking at downtown Seattle from a higher vantage point. From Cap Hill in particular, all of downtown is visible including the Space Needle, with Lake Washington behind it-- here, what appears to be a river is beyond a fictional downtown skyline.
Seattle sits on the edge of Elliott Bay, which connects to Puget Sound. When Ellie and Dina look down at the city from "Capitol Hill," what looks like a wide river flows beyond the downtown view, with a tall hill beyond it. In real life, land is indeed visible beyond the bay, but not at that height. Additionally, the Space Needle should be visible from their vantage point, as it was shown to still exist in a previous episode. Also missing is I-5, a major interstate that runs between Cap Hill and downtown.
Though game-accurate, the scenes set in Seattle were clearly filmed elsewhere (in this case Nanaimo, BC).
Ellie and Dina are searching a pharmacy for medications, specifically mentioning painkillers; the cordyceps pandemic hit in 2003, with it now being 2029 there wouldn't be any usable pre-pandemic meds. Medications have a limited shelf life, especially ones made from organic molecules, which include opioid painkillers such as codeine, hydrocodone, morphine and oxycodone. They have a shelf life of about five years, after which they begin to degrade and lose their potency, after about 10 years they will have lost half their potency, and even under optimal storage conditions (kept in a vacuum sealed container in a dark, cool room) they would be completely inert after 20 years.