Quizzically Yours

 Family Plot
In silhouette through the door of the Registrar of
Births and Deaths, 41 minutes into the movie.

Frenzy
In the center of a crowd, wearing a bowler hat, three
minutes into the film; he is the only one not applauding the speaker.

Topaz
Being pushed in a wheelchair in an airport, half an hour in.
Gets up from the chair, shakes hands with a man, and walks off to the right.

Torn Curtain
Early in the film, sitting in the Hotel d’Angleterre
lobby with a blond baby.

Marnie
Entering from the left of the hotel corridor after Tippi
Hedren passes by, five minutes in.

Birds,The
Leaving the pet shop with two white terriers as Tippi
Hedren enters.

Strangers on A Train
Boarding a train with a double bass fiddle as
Farley Granger gets off in his hometown, early in the film.

Stage Fright
Turning to look at Jane Wyman in her disguise as
Marlene Dietrich’s maid.

Under Capricorn
In the town square during a parade, wearing a blue
coat and brown hat, in the first five minutes. Ten minutes later, he is one of three men on the steps of Government House.

Rope
His trademark can be seen briefly on a neon sign in the view from the apartment window, approximately 55 minutes into the movie.

Paradine Case, The
Leaving the train and Cumberland Station,
carrying a cello.

Notorious
At a big party in Claude Rains’s mansion, drinking
champagne and then quickly departing, an hour after the film begins.

Non exhaustive list of what?

Konvict and Sparky get it right.
its Hitchcock cameos.