While Frank is flossing his teeth and Trapper is trying to sleep, you can see Radar outside the swamp door waiting for his cue to enter.
Margaret mentions her father was a Colonel. She says it in the past tense indicating that he may be dead. She also mentions that she is an "army brat".
When the surgeons are drawing the burnt sausages to see who 'volunteered' to go to the aid station, only three drew sausages. Blake did not put himself in the running. In "Hawkeye Get Your Gun" (5.10) the surgeons draw cards to go to a South Korean field hospital. Unlike Blake, Potter puts himself drawing as well.