Side effects of primaquine administration include nausea, vomiting, and stomach cramps. Other known adverse effects that occasionally occur are headache, visual disturbances and intense itching. Primaquine has also been shown to cause Hemolytic anemia in people of African or Mediterranean descent; this was a plot point in this episode, in which Lebanese-American Max Klinger and Jewish-American Orderly Goldman developed anemia while taking primaquine, confusing the doctors who thought it was only a possibility if he were of African descent.
One of the rare occasions where Hawkeye gives someone a direct order.
First episode where a factoid (about primaquine) appears during the epilogue.
While Hawkeye's sharing of Colonel Potter's blood pressure issue is meant to help, it is a violation of the Hippocratic Oath, which includes privacy of patient information.
When Margaret brings Potter breakfast, he denies being a member of Don McNeil's Breakfast Club. This is a reference to a popular NBC Blue Network/ABC morning radio (and briefly TV) talk and variety program, hosted by NcNeil and based out of Chicago. It aired for 35 1/2 years from June 1933 until December 1968, making McNeil the longest tenured host of an entertainment program in US history - ahead of Johnny Carson on the Tonight Show (29 1/2 years) and Bob Barker on The Price is Right (34 2/3 years).