Colonel Blanchard states that he almost became one of the pilots to drop Fat Man on Hiroshima Japan during World War II. Fat Man was dropped on Nagasaki. Little Boy was dropped on Hiroshima.
When Major Jesse Marcel is photographed with crash objects in the film he looks stunned and angry, in the actual photos released by the Air Force in 1947 he looks relaxed and is smiling.
In one scene set around the time of the alien crash the song "Stay all Night, Stay a Little Longer" by Bob Wills and His Texas Playboys is played as background music. Unfortunately the version played is from the album "For the Last Time" recorded in 1972.
In 1947 New Mexico used a numbering system for it's license plates - the first number identified the car's county. Roswell is located in Chaves County which was number 3 in 1947 and changed to 4 in 1948, in this film all the vehicles display plates with a number 4, the wrong number for the time depicted.
When Maj. Jesse Marcel gets off the plane at Carswell AFB in Fort Worth, Texas, there are mountains in the background. There are no mountains in or near Fort Worth.
When Maj. Jesse Marcel got off the plane at Carswell AFB in Fort Worth, TX mountains could be seen in the background. There are no mountains in or near Fort Worth.