The Out of Towners (1970)

Continuity mistake: After just missing the first train, and then finding out that they may be able to take a taxi to catch it further down the line, George runs back into the terminal to find Gwen, who had gone to the ladies' room. As he's asking the cleaning woman where the ladies' room is, there is a woman visible in the background, putting on her coat and starting to walk away from the rest room. In the same shot, George runs to the ladies' room to retrieve Gwen and actually passes the woman as she is walking toward the camera. In the next shot, as George reaches the ladies' room door, the woman is back where she started from, and is again putting on her coat.

George Kellerman: My wife can verify that. Gwen?
Gwen Kellerman: I can verify that.