Most of this movie was shot with a 9mm camera lens.
Writer, Producer, and Director Jonathan Miller explained that the reason that none of the actors or actresses (even those playing non-human characters) wore costumes aside from Victorian period dress, was that he thought it was ridiculous to get big name stars to play parts (as he did in this movie and MGM had done in Alice au pays des merveilles (1933)) and then cover them up in big costume animal heads so they were unrecognizable.
Jonathan Miller's son attended the opening of an Alice exhibition at the V&A in 2021, where a 2-minute clip of the tea party is shown. He admitted his father had no interest in making Alice as a children's film, he saw it as a piece about mental illness.
Jonathan Miller's son said that even when his father's Alzheimers was at its worst he could always locate the DVD of this film. He would ask everyone "have you seen it?"