Before going to bed, Lois closes the window and draws the curtains. However, in the next scene when the wolf appears at the window, it is open and the curtains have been pulled back.
In Perry's office, he tells Clark, Lois and Jimmy that their flight departs in 33 minutes, allowing no time to stop at their apartments for clothes for the trip. Lois protests that she hasn't a thing to wear. They then leave for the airport, presumably without luggage, and with only the clothes they're wearing. Yet, at the lumber camp, all three reporters have pajamas, robes, and a change of clothes, and Lois has a full suitcase.
As the early scene dissolves into the lumberjack Oliviere confronting the wolf, you can just see the actor's eyes looking to his right as if waiting for the director to call "action". As the shot finishes dissolving to his scene, you can see him start to act afraid.
Clark goes out onto the train caboose and then looks left and sees that the train trestle has been sabotaged. Later when the train passes the trestle, the conductor, Lois and Jimmy look in the same direction, even though they have passed the trestle and should be looking the opposite direction.
As he often does, Clark, with a smirk and tongue in cheek, tells Jimmy that it's just an old superstition that people can change themselves into wolves and vice versa, alluding to his own ability to change into Superman and vice versa.
When the "wolf" appears after the girl, it is clearly wearing a leash.
Perry White says he's booking a flight on "Consolidated Flight 64" for Clark, Lois and Jimmy. The aircraft later shown (obviously stock footage from some old film) is clearly marked Pan American Airways.