Audio/visual unsynchronized: Polly Walker's digital answering machine makes sounds of a tape transport machine as it intercepts a message.
Revealing mistakes: When Gus and Carly are at the grocery store, Gus doesn't pay for his item.
Crew or equipment visible: In the opening sequence, during the fall from the balcony, a cable or wire is clearly visible.
Miscellaneous: When crossing the street, a cab stops, honks, and driver says "why are you walking here?" as a nod to "Midnight Cowboy."
Continuity: The shooter's clothes change between the last shooting and the time the cops get there.
Plot holes: Carly locked herself into the video room and Zeke could only enter the room by breaking into the circuit board. The room surely must have been kept locked when he was away. How did he usually get inside?