Like many episodes of "Alfred Hitchcock Presents", this one is directed by Paul Henreid, the famous Warner Brothers actor who made such distinguished movies as "Casablanca" and "Now, Voyager". In all, he directed 28 episodes of the show...more than those directed by Hitchcock himself.
The story idea is one that is very, very unlikely...though how it occurs is definitely possible, to the overused trope works. A man is walking down the street when a falling board konks him on the head. He seems okay at first, but his memory is gone....and he has no idea who he is. Using a piece of pape a $1000 bill and a key, all things in his pockets, he tries to piece together who he is. The big clue is the name of a doctor...so he goes to see the man.
While the story idea could have worked (temporary amnesia due to head injuries can occur), the ending came as no surprise at all. My wife and I watched it together....and we both guessed the surprising ending. Regardless, it is entertaining and worth seeing....just nothing all that special.