Doris Day wrote in her 1975 autobiography that this was one of the films that she did not want to do but was forced to do because her husband/manager Martin Melcher had power of attorney and signed her for it without her knowledge or consent.
Although this film is set in Europe, the entire production was filmed on the 20th Century Fox back lot in Los Angeles.
Final film of actor Reginald Gardiner.
Opening in the US just before the winter holidays, a portion of the film's ad campaign featured Doris Day under a decorated tree, surrounded by presents, holding up a gift-wrapped package with the caption "Do Not Disturb... Until Christmas."
There is a neat in-joke in the film. When the French children find out that the character played by Doris Day is American, they ask her whether she knows Rock Hudson or Cary Grant - who had both been recent co-stars of the real Doris Day. Hudson costarred in Pillow Talk, Lover Come Back and Send Me No Flowers. Grant costarred in That Touch of Mink.