The medic guarding Soon-Lee is wearing a helmet with the Red Cross painted on the front. The practice of painting the Red Cross on helmets was stopped in early 1951 because North Korean snipers were using them to aim.
Hawkeye hands over Radar's teddy bear but this isn't the bear seen in Season 8, Episode 5 "Good-Bye Radar: Part 2". Hawkeye picks up Radar's teddy bear and you can see that the bear is brown not olive drab, that the bear has got a plastic nose and also the bear is missing its left eye.
When Margaret is standing by the time capsule at the end of the episode, she is holding the broken fan belt and Radar's teddy bear. When the camera angle changes to the side view, she isn't holding anything.