Operation Avalanche

The filmmakers told NASA they were making a student documentary on the Apollo program in order to get permission to shoot there.

At around 60 minutes into the movie, Matt marks Friday the 17th of April (or of another month with only 30 days) as a deadline date, on a wall calendar that has the 1st of January on a Wednesday. The scene takes place in the year 1969. However, although 1 January 1969 is indeed on a Wednesday, 17 April 1969 is on a Thursday, not on a Friday.

In fact, there is no "Friday the 17th" in the year 1969 except in January and October, which are months with 31 days. And the only calendars that have 1 January on a Wednesday as well as 17 April on a Friday, are calendars of specific *leap years* such as 1936, 1964, 1992 and 2020.

In other words, the scene reveals that the filmmakers used a calendar of the wrong year as a prop.

Features Die Reise zum Mond (1902)