When Sylvester yells for a cop outside the mansion, Henry gets left outside. Jimmy opens the door and pulls Henry in roughly. In doing so, Henry loses a shoe. Inside the mansion, Henry has both shoes, never having retrieved his shoe from outside.
When Sylvia is cracking eggs, she cracks and opens the second egg twice.
Emergency doors are not put in private cabin seating areas. It was common practice to avoid passengers falling or leaping to evade paying for tickets. They are found more public in the coaches where many sit in one car.
Once Jimmy pulls the emergency cord stopping the train, he and Sylvia leap no more than a foot (third of a meter) off the train. That makes the huge train wheels with all that momentum and torque up at the engine to all the cars behind have metal wheels the size of tricycles or automobile tires. Train wheels have been known to be at least (give or take) two yards (two meters.)
When Sylvia and Michael are having a conversation and then lie down to go to sleep, their conversation continues though their lips have stopped moving.