In the climax of the picture, Trusty was originally killed when hit by the wagon. That is why Jock nudges him and he does not rouse. When Walt Disney viewed this scene, he was shocked. Walt did not want a repeat of the traumatic scene in Bambi. He thought it was too intense. Walt then made the animators put Trusty into the end Christmas scene to reassure the audience that Trusty was simply knocked out and injured in the previous scene.
The 1962 re-release of this film was shown on a double bill with the first release of Disney's Almost Angels.
The background artists made models of the interiors of Jim Dear and Darling's house and shot photos from a deliberately low angle to simulate a dog's eye view of their world.
The Beaver character was effectively recycled as the Gopher in Winnie the Pooh and the Honey Tree, right down to his whistling speech pattern. This voice was originally created by Stan Freberg who had a background in comedy voices. The demands of voicing the character proved too much, however, so Freberg eventually resorted to using a real whistle to capture the whistling effect.
The decision to film in Cinemascope was made when the film was already in production, so many background paintings had to be extended to fit the new format. Overlays were often added to cover up the seams of the extensions.
The film's opening sequence, in which Darling unwraps a hat box on Christmas morning and finds Lady inside, is reportedly based upon an actual incident in Walt Disney's life. After he'd forgotten a dinner date with his wife, he offered her the puppy-in-the-hat box surprise and was immediately forgiven.
The film's setting was partly inspired by Walt Disney's boyhood hometown of Marceline, Missouri.
The first feature-length animated movie to be made in widescreen (2.55:1). Made simultaneously in both a widescreen CinemaScope version and a standard Academy ratio version. It's also the widest film the company has ever created.
The mischievous young puppy at the end of the film (the one who resembles his father, Tramp) is called "Scamp". He was featured in a children's book, a syndicated daily comic strip, and comic books, before starring in Lady and the Tramp II: Scamp's Adventure.
The original story was created by Joe Grant while Snow White and the Seven Dwarfs was nearing post-production. Ward Greene used Joe Grant's original version as the basis for his novel. Greene's novel was still being written while the film was still in production. Grant's wife was said to have been angry over the story being "stolen" but Walt Disney maintained all legal rights to the story.
The song howled by the dogs in the pound is "Home Sweet Home". It is the only song to be in the film that was not written by Peggy Lee and Sonny Burke
The studio's first officially self-penned story since Dumbo.
To maintain a dog's perspective, Darling and Jim Dear's faces are rarely seen.
When we are in the "December" month of Darling's pregnancy, we see her writing down some girl names. The names are Betty Ann, Betty Lou, Betty Ann Lou, Betty Lou Ann, Mary, and Mary Lou. Betty Ann Lou and Mary Lou get crossed off the list.