Young Tony Curtis and Young Houdini performing Magic [German Newspaper clipping from Janet Leigh Collection at Margaret Herrick Library]

Both performed most of their own tricks/stunts in their respective films:

• Tony Curtis performs many of the tricks of the master himself in “H o u d i n i,” the Paramount picture…This accomplishment is probably worth noting, since the illusions could so easily be faked in a medium that itself used to be known as “the magic lantern.” [Newspaper clipping from Janet Leigh Collection]  In fact, George Boston (magic instructor) and Joe Dunninger (magician who inherited some of Houdini tricks and books) were technical advisors on the magic and escapes.
• Harry performed most of his own stunts in “The Grim Game”, despite the fact that they could easily be faked by movie magic editing and using a stunt double (e.g., plane to plane transfer).

Both performed magic tricks on the set of their respective movies:

• Tony Curtis made up as old man showing magic tricks to studio workers. The consultant on the movie, George Boston, is the fellow in the black tie and dark coat. [Paramount Pictures Corporation]
• Houdini performs on the Famous Players-Lasky
  Backlot

Both got injured making their respective movies:

• Tony Curtis sprained his right ankle .[Paramount Pictures Corporation]
• Houdini risked his life and sustained injury in making “The Grim Game”

Both are Kings of Cards:

• Tony Curtis King of Cards Still [Paramount Pictures Corporation]

• Houdini King of Cards Poster