Alfred Hitchcock was famous for the brief cameos he made in his own films and this compilation is a reminder of the fun that can be had looking out for them.
I think my favourite is the one from Lifeboat (1944) but it is also interesting to note what he does in them.
Note that some involve a musical instrument: inย Strangers on a Train (1951) he carries a cello; Rear Window (1954) sees him near a piano; and Vertigo (1958) sees him carrying a bugle.
Another motif is that he often walks across the scene from left to right.