Continuity: When John finally introduces himself to Gerry, he is holding his book up, but in the next cut it is in his lap.
Continuity: The position of Tom's tie changes from when he first kneels at the wedding, and in the following cut.
Continuity: Gerry's hand changes position when hiding in the closet from the Wienie King.
Crew or equipment visible: During the shoot out on the train, the cracker bowl is knocked over. The rod used to knock it over is visible.
Revealing mistakes: Gerry (Claudette Colbert) is referred to as "tall," "dark-haired," and "long-legged." She is in fact short, blonde, and rather shorter-than-average of leg.
Continuity: On the train: the men with the shotguns shoot out the glass of the same window several times.