Continuity mistake: When Katherine realises she can use Euler's Method to calculate how to bring John Glenn safely back to earth, she is seen wearing a wristwatch when she's at the chalkboard. The watch is not on her when she leaves to get a book about Euler's Method. It reappears when she's back at the chalkboard.Matt Peters
Continuity mistake: When John Glenn is attempting re entry, Dorothy Vaughn is driving out to the beach/country and she stops the car near a barn where there is a dark and creamy two tone car parked. The scene cuts straight back to the city to see the other girls watching re entry and the exact same two tone car is parked on the side of the road.Scottb
Continuity mistake: In the scene in the briefing room, some of the calculations on the blackboard change writing styles between shots, such as brackets moving closer to numbers.
Continuity mistake: In the last scene in which Vivian gives Dorothy an assignment, her lanyard is at first hanging neatly from her neck. The camera goes back and forth between her and Dorothy, and when you last see Vivian, the ball chain for the lanyard is no longer hanging neatly; it is pulled to the side because it's caught on her jacket lapel.Matt Peters