During the scene at the Mount Rushmore visitor center - when the blonde is just about to shoot Cary Grant a little boy in the background sticks his fingers in his ears because he knows the blanks that will be fired are going to be loud. Obviously took a few takes before the final "shot" was printed!
If you think in life terms the boy could have been covering his ears so he didn't have to listen to his mother, or anything like that. i.e. What was his character doing. All in all, some one should have noticed. I still vote 7.
This is a very "famous" slip-up. In the scene no one knows she has a gun until she shoots Roger (Cary Grant). The boy was reacting to the gunshot from having been through several takes. There is no way he would have seen the gun before it goes off. As finicky as Hitchcock was, it's surprising he didn't catch this.
actually Hitchcock may have more clever that you think. If you closely watch the odessa steps sequence in the Battleship Potempkin, you will find another little boy who is doing the same thing. Additionally there is also a scene of a man being shot in which the camera only focuses on his shoes; the same shot hitch uses when martin landau is shot on MT. Rushmore. Hitchcock was a careful student of the pionneering directors that went before him and he pays homage to Eisenstein in North by Northwest.
I think Hitchcock left this in as a little joke. In "Strangers On A Train" Hitchcock appears on the train with his back to the audience playing cards with other passengers. A close-up shows his hand with 12 cards, one of every card in the deck, 2 thru king. This is obviously not a slip-up, just a little joke that he included in an otherwise totally serious movie.
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