When Dr. Montgomery (Alastair Sim) deals with the blow Jim Colter (John Mills) sustained to his head, he applies a round sticking plaster. In the next shot it has changed to a horizontal rectangle. When Jim arrives at the Alcazar club, the plaster is a vertical rectangle. By the time he reaches The Lucky Star to accost Ted Purvis (Stewart Granger) the plaster has disappeared.
In the fight scene near the end of the film, Jim Colter (John Mills) pulls Ted Purvis' (Stewart Granger) jacket down over his arms to disable him. In a split second and a change of camera shot, dapper man-about-town Ted is wearing his jacket correctly again.
In the final scene the shadow of the camera falls upon Alistair Sim's sleeve when he passes the model train to the baby in the pram.