Continuity mistake: While Alfred consoles Bruce over the death of Karen, Bruce's head immediately changes position depending on the angle of the shot.
Continuity mistake: During Barbara and The Lady's meeting in the club, The Lady's glass is on the table. The next shot The Lady is holding her glass off the table.
Continuity mistake: When Alfred walks into the cabin, gun drawn, his right hand is already bloody, despite the wounding happening 5 seconds later.
Answer: "The Merc" was a warehouse like store with aisles that sold mainly weapons, machetes, AK-47s, C-4, barrels of acid, etc. In s02e05, "Scarification", it was shown being raided by GCPD.
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