Sophie the horse is a different color than the one Radar gave to Col. Potter. Obviously a different horse.
In this episode, Charles adds a sign for "Boston" to the top of the camp signpost. Boston was already on the signpost in previous episodes, for example in the beginning of "5'o clock Charlie" from season 1.
When Dupree leaves the swamp to go ride Sophie he has his pants and cowboy boots on but when Col. Potter stops him he is only in boxers and cowboy boots.
Throughout the episode, both Lt. Anderson and Major Houlihan's fingernails are over half an inch long. No nurse, especially a head nurse as Major Houlihan, would have fingernails that long.
Throughout the episode, both Captain Anderson's and Major Houlihan's fingernails are over half an inch long. No nurse, especially a head nurse as Major Houlihan, would have fingernails that long.
When Charles walks in front of the jeep at the end the shadow of the camera is visible on his back.
The pointers on the signpost obviously point in the wrong directions (if Seoul is correct, then the rest of directions are wrong).
When nurse Anderson is lured to Winchester's arterial transplant, BJ clearly asks Houlihan for a scalpel. She gives him a clamp instead. Neither of them notices this.