Honor Blackman and Jackie Pallo, a wrestler, have a fight scene in a graveyard. In one take, Blackman accidentally knocked out Pallo for four minutes (she forgot to feint first, then kick, and simply kicked him in the head, knocking him onto the concrete floor of the studio). The incident garnered plenty of publicity in the British press. Blackman was in tears when it happened and sat by him until he recovered.
Steed tips his hat to the skeleton, but only says, "Good evening" instead of the line in the script, "How's the wife?"
The original script gave Arthur's age as 58, not 48.