George the dog is played by Skippy, a wire-haired terrier better known to film fans as Asta from MGM's The Thin Man series. He also had played Mr. Smith, the dog whose custody Cary Grant and Irene Dunne fight over in The Awful Truth.

Grant's explanation for wearing women's clothes in the film, "I just went gay all of a sudden," was improvised on set, which may explain how it slipped by the Production Code Administration (PCA), Hollywood's self-censorship group. Between 1934, when the PCA began strict Code enforcement, and 1961, when the Code was amended, any mention of homosexuality was strictly forbidden on screen. This marks the only use of "gay" to mean "homosexual" in a Hollywood film of that era. Some historians have suggested that it's the screen's first use of "gay" in a sexual context.

Another improvisation occurred when Hepburn accidentally broke a heel while she and Grant were hunting for Baby. As she limped around the set, she said, "I was born on the side of a hill," and Hawks left it in. She would later say that Grant had whispered the line in her ear.

Hawks inserted a reference to Grant's previous screwball hit, The Awful Truth, in Bringing Up Baby when Hepburn pretends to be a gangster's moll. She says that Grant is a crook called "Jerry the Nipper," the same nickname Irene Dunne had given Grant in the earlier film when she pretended to be his low-class sister.

Grant's circus background came in handy for the final scene, in which the dinosaur skeleton he's working on collapses, and he pulls Hepburn up onto his scaffold after her ladder falls over. He drilled her on exactly when to let go of the ladder and how to grab his wrist to make sure neither would be hurt.

FUN QUOTES FROM BRINGING UP BABY (1938)

"Now once and for all David, nothing must interfere with your work. Our marriage must entail no domestic entanglements of any kind." - Virginia Walker as Alice Swallow.

"Your ball, your car. Is there anything in the world that doesn't belong to you?" - Katharine Hepburn as Susan Vance.

"The love impulse in man very frequently reveals itself in terms of conflict." - Fritz Feld as Dr. Fritz Lehman, later quoted by Katharine Hepburn as Susan Vance.

"Let's play a game...Watch, I'll put my hand over my eyes, and then you go away...See, and I'll count to ten, and when I take my hand down you will be gone!" - Cary Grant as David Huxley.

"If you had an aunt who would give you a million dollars if she liked you, and you knew she wouldn't like you if she found a leopard in her apartment, what would you do?" - Katharine Hepburn as Susan Vance.

"I just went gay all of a sudden." - Cary Grant as David Huxley.

"There is a leopard on your roof, and it's my leopard, and I have to get it, and to get it I have to sing." - Katharine Hepburn as Susan Vance. "Out of seven million people, why did I have to run into you yesterday?" - Cary Grant as David Huxley.

"You mean you don't want me to help you any more -- after all the fun we've had?" - Katharine Hepburn as Susan Vance.

"In moments of quiet, I'm strangely drawn to you, but -- well -- there haven't been any quiet moments." - Cary Grant as David Huxley.

"Hey, flatfoot! I'm gonna unbutton my puss and shoot the woiks. An' I wouldn't be squealin' if he hadn't a give me the runaround for another twist." - Katharine Hepburn, as Susan Vance, posing as Swinging-door Susie.

"Well, there's nothing else I can say except that I'm glad before our marriage you showed yourself up in your true colors. You're just a butterfly!" - Virginia Walker as Alice Swallow.

Compiled by Frank Miller