The airbase radio controller used Mr. Nelson's radio call sign in spite of not having been given the call sign.
The pressure suit was open at the hands. Since pressure suits require a full seal, this would render it useless.
The radio operator on the airbase spoke with a Spanish accent, indicating that the airbase was owned by a South American air force, yet the aeroplane had distinct U.S. markings on it. Further, the U.S.A. has never had any airbases in South America.