The Irish sequences were tinted green for the original release.
Anne Baxter refers to someone who owns a boat named Sean O'Fearna as the man who can take Tyrone Power out of the Irish village. In fact, Sean O'Fearna is the real name of director John Ford.
The novel upon which this is based, "For Fear of Little Men", was purchased in July 1947 for $50,000.
An atmospheric scene designed by Henry Koster to introduce the leprechaun was cut by producer Darryl F. Zanuck, according to the director.
Peggy Cummins was first considered as Norah, while both Barry Fitzgerald and Will Fyffe were contenders for the role of the leprechaun.