Continuity: When Lucy is going through Peter's things at her apartment, she finds a can of cat food that has a smooth top and requires a can opener to open. In the next scene, when she goes to his apartment to feed the kitty, she opens the cat food by pulling off the top, like the can has a pull top.

Continuity: While Jack and Lucy are walking along the waterfront, she tells him that he '...just stepped in doggy poopie.' There is a long shot of the couple as Jack looks at his feet, and the sidewalk is spotlessly clean where they just walked.

Continuity: In the Christmas family picture scene, the camera seen in Elsie's hand is a Brownie camera(35mm size). When picture is actually taken, she uses a flat type(110 size film) camera with a tall flash on it.

Factual error: When Lucy jumps off the platform to save Peter, and is trying to wake him, the oncoming train blows its whistle. However, the L-trains/subways in Chicago do not have whistles like ground locomotives do.

Audio problem: In the scene where Lucy first enters Peter's hospital room, you can hear a respirator, and he is not hooked up to one. Also, the respirator noise is much faster than an unconscious human should be breathing.

Continuity: When Lucy and Jack are moving the couch into Peter's apartment, Lucy gets bumped and falls into a table, knocking over a vase of flowers. (This table and vase are located directly below a mask on the wall.) Earlier in the film, when Lucy enters Peter's apartment for the first time (to feed the cat) we see her slowly entering the living room in the same area where she later falls - the mask is there, but the table and vase of flowers are not.

Continuity: In the scene where Lucy is in the Callahan's house at Christmas at the very end of the scene it shows her stocking and her name on it is in white letters. However, in the scene where Mary comes in and tells the family that Lucy is pregnant, the camera pans to Jack who is standing right beside Lucy's stocking, only this time her name is in black letters.

Continuity: In one of the hospital scenes she has her purse across her chest, then the camera goes back and it's hanging from her shoulder.

Other: In the scene where the entire family is squeezing on the elevator just after Lucy revealed that Peter only has one testicle, one actor in the back of the elevator keeps repositioning himself so he is constantly visible to the camera, even going so far as to stand on his tip toes.

Continuity: In the scene where Jack comes home and sees Lucy asleep on the front couch, when he walks in the front door, there is a window in the door without a curtain. In the morning when Lucy goes to leave the house, the window has a curtain on it. When there isn't a curtain, you can still see the little metal things on the door where the curtain would hook in.

Continuity: Sandra Bullocks' haircut keeps changing slightly throughout the whole film. Sometimes her fringe is very short and frizzy, other times it is long enough to tuck behind her ears.

Continuity: After Lucy jumps off the platform to save Peter and the train finally arrives, the shot from above shows them under the edge of the train, as if they are being crushed. The next shot from the side shows them safely clear of the train but reveals that there is no space under the train for them to have survived as the train supposedly passed over them.

Continuity: When Lucy is talking to Mary through the booth window, there are bars across the window. But at the end of the movie, when she is again talking to Jack through the window, while his family look on, there are no bars across the window.

Continuity: When Lucy goes to open the door, the globe lamp on the mantle is on. When she lets the visitor in, and they pass the same mantle, the globe lamp is just a globe and is not illuminated.