After his first meeting with Number Six, Number Two leaves the flat, and twenty seconds later he's back in the Green Dome watching Number Six finishing his conversation with Eighty-Six.
John Sharp is credited by his alias "John Sharpe" in the credits.
Goof: In 'A Change Of Mind' after approximately 9 minutes have passed and as Number Six walks up a bricked walkway, you can see a white car pass in the background at the end of the walkway.
Committee Member: It is the duty of this Committee to deal with complaints.
Number Six: Complaints?
Committee Voice: Your complaints.
Number Six: Well done. I have several.
Number Two: Do carry on.
Number Six: No time for tea?
Number Two: No. Only your future.
First Member of Social Group: All right, say you're a poet and you were composing, and you failed to hear Number Ten's greeting.
Second Member of Social Group: Neglect of social principle.
Number Six: Poetry has a social value.
Second Member of Social Group: He's trying to divide us.
First Member of Social Group: His intentions are obvious. To stop us from helping this unfortunate girl.
Number Forty Two: You're trying to undermine my rehabilitation. Disrupt my social progress!
Number Six: Strange talk for a poet.
Second Member of Social Group: Reactionary!
First Member of Social Group: Rebel!
Number Forty Two: Disharmonious!
Number Six: You still have a choice. You can still salvage your right to be individuals. Your rights to truth and free thought. Reject this false world of Number Two. Reject it. Now!
(addressing crowd with Number Two in attendance)
Number Six: To borrow one of Number Two's sayings, "The butcher with the sharpest knife has the warmest heart."
Number Two: There is a saying, "The slowest mule is nearest to the whip."
Number Six: And another. "He who digs a pit will one day lie in it." Or is Number Two above investigation?
Number Six: (to Number Two) Public enemy, Number Six?
McGoohan directs under the pseudonym "Joseph Serf."
The filming of this episode commenced on January 23, 1967.