A. B. and C. - S1-E3
Continuity mistake: While Number 6 follows Number 14 around the Village, her briefcase keeps switching itself from her right hand to her left between shots, without her having moved it. Later, when she enters the hallway, the case disappears altogether.
A. B. and C. - S1-E3
Continuity mistake: During the dance, the bottle of wine on Number 6's table is sitting on the left side. No one touches it, but when he and B come back to the table, the wine has moved itself to the center.
A. B. and C. - S1-E3
Continuity mistake: Number 14 has to push a button to activate the first tape she puts into the player. She then puts on the 'A' tape and it starts playing by itself, with no button pushed. When she puts in 'B,' though, she has to push the button again.
A. B. and C. - S1-E3
Continuity mistake: When Number 6 kicks out the grill, his socks are blue. In the next shot, though, the socks have turned brown.
A. B. and C. - S1-E3
Continuity mistake: The length of A's cigarette varies considerably between takes. It's short in long shot, then gets suddenly longer in the following close-up.
A. B. and C. - S1-E3
Continuity mistake: Number 6 substitutes clear water for the red-tinted drug in the syringe. But when Number 14 later injects him with the same syringe, the fluid in it has turned red again.
Answer: It's even more obvious than you think, you know who number 1 is in the very first episode. When 2 replies to the question "who is #1?" Change the way he answers from you are number one (in the monotone or accented answer to, "You are, number 6. The comma gives you the answer. #6 is #1. It's the tone of the answer.