The jet bomber at the end of the film is an English Electric Canberra, except for one shot where it mysteriously becomes a late-model Gloster Meteor jet fighter.
In the train scene early on Forrest Tucker is reading a fresh, crisp, unwrinkled newspaper when Janet Munro has one of her bad spells and falls in his lap. As she falls, Tucker's newspaper looks like it has gone through a few takes already.
In the lab Prof. Crevett states the walls are steel reinforced. Yet when the monster breaks through the office wall where Anne Pilgrim is, there is obviously no reinforcement in the wall or in the piece of fallen wall shown.