The elevator in the Northern Star Hotel crashes. Elevators are designed so that it is nearly impossible for them to crash.
In the distillery, the Player must thread a handle onto a piece of rebar in order to get to the mounting. Then the Player must turn the handle - which conveniently turns despite still being threaded onto the rebar.
The position of the pistol's internal capacity modification is lopsided, which makes for a poorly balanced weapon.
A Russian newspaper has an English headline.
Considering the length of time since the events in the newspapers that were printed and can be found strewn about, the newspapers should have faded and rotted away.
The Quarantine Zone has many things living within that should have starved to death by the time if the current events.
Carded doors are never equipped with an automatic door closing piston, even though they should be for the sake of security.
It does not make sense that it is possible that the actions input into a control panel can cause catastrophic damage.
In the parade there are multiple vehicles which have car alarms going off. Given that more than a dozen years have passed since they were supposedly last used, the batteries should have drained by now.
Miss Vance states that an inactive medical unit needs power, but it actually needs the creature that the machine gets its medical functions from.
Enemy NPCs occasionally refer to singular opponents in the plural.
Russell states that the wiring in the Northern Star is ancient, but it appears to be the more modern Combine wiring.