Continuity: When the "ghost" is first seen, it is mostly obscured by a curtain; only its right shoulder is visible. In the next shot, however, it is right in the middle of the window, and nearly the entire cutout is exposed.
Three Men and a Baby (1987) - 2 mistakes
Directed by Leonard Nimoy, starring Nancy Travis, Steve Guttenberg, Ted Danson, Tom Selleck
Please note: There is no ghost in the background when Ted Danson's talking to the mother - it's a cardboard cutout of Ted Danson, and any stories about it being the ghost of a boy who was killed in that apartment are (unsurprisingly) rubbish - for a start it's a set build in a studio, not a real apartment. Don't e-mail me arguing the point - that's my last word on the subject. For a detailed break down, including pictures PROVING IT'S A CUT-OUT, follow this link: http://www.snopes2.com/movies/films/3menbaby.htm.
Plot hole: In the scene where Sylvia is waiting in the hallway for the guys to come back from the airport, she is sitting on the floor with the baby. You can see the stroller next to her, and it is already fitted with the extender so all four of them can push the stroller together. They use this for the first time in the very last scene of the movie, after Sylvia and the baby move in. It wasn't used before.