When Sgt. Anderson whacks Slip's feet, Slip's feet are 20" apart in one shot then 8" apart in the next.
In 1950, Air Force leadership moved away from the rank identifications of the Army, therefore, an Air Force member wearing two stripes would have been generally addressed as "Airman" not Corporal. The rank formally would have been Airman Second Class.
When Slip and Sach enter the Air Force base, they are indeed on the base but actually exiting it. This is evident by the "Allen Air Force Base" sign and the sign on the building seen past the gate.
The other H. Jones, whose orders Sach receives, never appears.