Some of us can spot it. In the Apollo 13 movie, I could tell the real dialog (recorded in history) from the fake dialog.

The big failure was right after the explosion. There was a desire to show the level of stress at that time, so the script writers had the astronauts be antagonistic toward each other and generally unproductive. As I watched that, I instantly saw a bunch of wimpy unstable Hollywood types instead of carefully screened professional test pilots.

The intro dialog was also really forced, and the historical dialog contradicted the direction that rockets were fired when returning.