Apollo 13 (I) (1995)
Scene 1 [12 minutes 40 seconds]: Swigert is shown about to enter the simulator for trraining. But as part of the backup crew he has to wait till the main crew is finished, so they can enter the same simulator when they are done.
Scene 2 [20 minutes 15 seconds]: When Lovell is told that Swigert will be a last minute replacement for Mattingly, Lovell says: "Jack Swigert has been out of the loop for weeks.[...] He's a fine pilot but when was the last time he was in the simulator?", implying that Swigert has not trained in a simulator for quite some time. (This is two days before the launch.)
Strictly speaking there is no contradiction in Swigert shown ready for simulator training in the first scene, and at a much later date, in the second scene, Lovell saying that Swigert hasn't been in a simulator for weeks.
However this course of events does not make sense, as the first scene does imply that the backup crew does similar training sessions as the main team. A viewer would expect that the backup crew would certainly get much of the same training, on a regular basis, in the weeks before the launch. Especially for something which the movie specifically shows to be important, namely simulator training.
Boom mic visible
Crew or equipment visible
Errors in geography
A similar mistake was made earlier in the movie when they were talking about transferring amps from the lunar module to the command module. But between the two batteries, the current will flow only from the more charged one to the less charged one, and then only until their voltages are the same.