Soldier's story of Eskimos wife swapping is far out of date. While situations did occur in some tribes where a spouse could be comforted when another spouse was on a long hunt, as the tribes moved from the open into settled towns and communities the practice largely ended.
The business card the FBI agent gives Hap shows a phone number with a 972 area code for the Dallas office. The 972 area code was not used until 1996.
About halfway through there's a hospital scene with a digital IV pump in the background which I don't believe existed at the time.
20 year old money, missing from a robbery. would attract a great deal of attention. Hap sending the children's fund the amount of money that he did (in cash) would have sent the FBI directly back to him, especially since his fingerprints are on the envelope.