Harry Jr's dad had a bit of misdirection that was priceless and latter borrowed (kindof) by Franz Harrary. . .
Mr. B would do a classic silk strand production to one side of the stage, producing a huge number of silks that got balled up between he and an assistant... when they were tossed into the air and fell to the floor a Burro would appear. The audience would gasp and applaud when a sudden boom and whoosh of smoke filled the other side of the stage. When the smoke cleared a full grown elephant was seen.
The burro and silks were the misdirection; the elephant was walked onto the stage without any sort of concealment.
I used this same concept in a short lived club act I did many years ago; The act opened with me in a high backed leather chair with me doing misc. manipulations with cigarettes, pipes, cigars and Champagne bottles ultimately leading to the girl appearing in a huge glass of champagne. . . we moved into and Asrah levi and while the audience was watching her float into the air, etc. the real assistant walks out in a very flashy white dress, lights a cigarette as she sits in the chair, turning it away form the audience to face the back curtain. . . no one ever saw her do this because of the Asrah.
These are extreme examples of stage-craft misdirection but they each show just how powerful the ploy can be.