The Andromeda Strain/Headscratchers

1971 Movie

• All the rubber and plastic, etc on the crashed airplane was gone, but there's a landing gear with a tire sticking out of the wreckage.
• The big heart-stopping finale is solely due to the fact that Wildfire (which had been in operation for months) was set to blow up unless the nuke-deactivating key was inserted before the time ran out, but the deactivation terminals weren't all installed yet. Wouldn't that be considered remotely important?