When they leave for the cave, it is dark. They show a scene of a bus driving and parking, and it's daytime. They arrive, and it's dark again.
In this episode Klinger says he and Charles are the same blood type but a season later in the episode "Life Time" Charles has to give blood to a severely wounded soldier and his blood type is totally different from Klinger's.
Since Radar was permitted to take out Nurse Nugent, rules about military fraternization between officers and enlisted apparently weren't enforced at the 4077th.
When reading the letter about her divorce, Margaret is wearing 1st Lieutenant insignia where her medical insignia is normally worn. Her normal rank insignia of Major is correctly placed.
Klinger tells his Social Security number, and it begins with "556." SSNs have always been assigned geographically (much like ZIP codes), with "556" being a code reserved for California. But as far as we know, Klinger was born and always lived in Toledo, Ohio, where he should have been assigned a number beginning with a code in the range of 268-302.
Hawkeye and BJ were complaining about the shower water being cold, but when Margaret is in the shower a few minutes later, there's steam indicating it's plenty hot.
The hymn the group sings at the Christmas party is Dona Nobis Pacem (Give Us Peace.)
When Radar offends the 8055th M*A*S*H CO over the phone, he starts giving name, rank, and serial number. This is only supposed to take place if you're a captured POW, per the Geneva Convention.
In this episode, Charles loses (to the black marketeers) the winterized suit that he flaunted in front of everybody in "Baby, It's Cold Outside." Serves him right!
Radar calls the 8055th M*A*S*H unit to try to get some sodium pentathol; this is the original M*A*S*H unit on which the book, movie and tv show were based.
Klinger comments to Kwang that he's thinking of getting a howitzer himself--"Just think of the self-inflicted wound it could make!" This is the same man who once said that he would never shoot himself because he would ruin a perfectly good pair of nylons.
When Hawkeye receives the howitzer instead of his expected jeep, Potter orders him to get rid of it because the sight of it in camp will draw enemy fire. After trying in vain to have it sent to a non-combat unit, B.J. suggests that they put it out of their misery by removing the firing pin and pouring cement down the barrel to render it useless. That's all very well and good, but it still looks like a gun, which was Potter's whole point.
In the closing credits of this episode, there are still shots of wounded Private Ferguson, Rich's fellow soldier (played by Hank Ross), and of Major Winchester that weren't in any scene of the episode. In fact, Major Winchester's looks like it was taken from Season 6's "The Winchester Tapes."
The writing on the notepaper Rich is using changes noticeably when he shows it to Hawkeye. The writing in the later shot is much more legible than in the previous shot.
Colonel Potter says he has been married for 35 years - but in "Dear Mildred" it is 27 years and in "Images" it is 38 years!
Colonel Potter says that Sonia Henie does a triple axel in her film but Sonia never did a triple axel. She could do a single axel, but the first woman to do a double axel was Carol Heiss in 1953, which would be after the movie in this episode was filmed. Sonia was very talented, but even today it is rare for female skaters to do a triple axel.
Although it's obvious they did it for better film angles, why would the doctors have spun Sergeant Davalillo 180 degrees while moving him him four feet from the tub to the table?
If a cool dip in a bathtub is so wonderful, why doesn't Hawkeye dig up the swimming pool he enjoyed with Trapper and Henry in Episode 65?
During Potter's recollection with Lill of doctoring during WW2, he refers to an incident which happened before D-day when a soldier took his girl to the beach at Brighton on England's South Coast. He tells how their tryst was interrupted by lights and soldiers practicing for D-Day.
I lived a few miles west of Brighton from my birth in 1943 and can attest to the factual inaccuracy of this section. Brighton was towards the western end of the section of the South Coast that had been regarded as likely landing grounds for the Germans since 1940. Access to the beach was denied to all and even the approaches to it were mined. Our house was about half a mile from the beach and I damaged many front wheels of my bicycle riding into the holes left when the minefields were eventually cleared.
Nor was the area used for large scale invasion practices which were generally held further west in Devon and Cornwall the beaches of which more closely resemble the Normandy beaches.
Finally, in the period leading up to D-day most troops of all nations were confined to their camps. This wasn't just a security precaution but logistics also; there were so many soldiers assembling in these areas that local facilities would have been overwhelmed had the soldiers been given free access to them.
I realise this is a fictional series and the inaccuracy didn't diminish my enjoyment.
In response to several disparaging comments about his mustache, B.J. places a false one on the outside of his surgical mask.