This is the first sketch page in production order. In The Hero of Three Faces panels shaped like a page torn from a spiral sketchbook denote "sketches" rather than "cartoons". The line between a sketch and a scripted cartoon strip can be blurry, but generally a sketch signifies a landmark in chronological order, and/or presents a gag not deemed strong enough to carry a cartoon or presents no gag at all. Sometimes they're multi-panel, and sometimes they're animated like this one.

This one is animated attempting to capture the look which Hawkeye and Trapper John give each other when something's weird, and is the first tv M*A*S*H cartoon in chronological order.