Trivia: It's in this episode that the Heimlich Maneuver is used for the first time by the paramedics. At the USC game, when a guy is choking on a hot dog, John and Roy are called, and John uses the Heimlich. Up until season 6 we've seen the guys use other methods, such as the ChokeSaver which look like huge white tweezers, to remove obstructions in an airway, as seen in 4x9, "Foreign Trade."
Trivia: There were no American planes shot down over the Sea of Japan during the Korean conflict. It is rumoured that producer/director Larry Gelbart knew that, but wrote Henry Blake's death scene as he was very unhappy with the way Mclean Stevenson had left the show, and was determined to make it clear that there was no way he would be coming back.
Trivia: While everyone is at the table eating supper and talking, little John Curtis taps on John's shoulder, then John turns and asks "What?" John Curtis points to his pants and excitedly says, "I got new pants," and John says, "I see that. Who got you those? Your mommy?" Then John Curtis looks offscreen, away from the other actors on set, and replies, "No, from Pat," (no characters named Pat are on the show) and without missing a beat, John responds, "From Pat? Where does she live? On the next farm?" And John Curtis answers, "Yeah," amidst all the giggles we can hear, so John answers with a smirk, "Okay, good!" This is such a hilariously precious unscripted moment, and great they decided to leave it in the episode. (00:26:15)
Trivia: "Kung Fu" was not canceled due to poor ratings, as it performed solidly during its run. It was canceled due to the physical stress and abuse on David Carradine's body, and it was wearing him out.