There is one episode where everybody is in Blake's office talking about something, and there is a sudden explosion outside. If you watch carefully, you can see Hunnicut wince right before they hear the sound. This is probably because he knew it was going to happen, and it is a pretty obvious mistake.
Blake and Hunnicutt weren't on MASH at the same time. Hunnicutt came after Blake left. Frank Burns was in command then. Potter came after that. Maybe you were thinking of Trapper John?
You are almost right. Trapper leaves and Hunnicut arrives in one episode (although we never actually see Trapper in that episode). Colonel Potter actually arrives in the next episode although they give you a small preview of his arrival in the first episode.
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