When Lucille Ball was dissatisfied with the actor cast as the secretarial candidate, she convinced her own personal secretary Wanda Clark to take the role. Clark says that she got the role because Lucy admired how fast she could type, something Lucy thought was important to the character. But the typewriter on the set was a manual and Clark had been using an electric for many years - so she had to fake it.
Harry Gives Lucy a framed photograph of himself as a gift. This is the same photo that hangs over Harry's mantle at home. It is actually a colorized black and white photo of Gale Gordon as Mr. Mooney that was seen several times on "The Lucy Show." At first glance, the photo is curiously cropped, with lots of 'head room'. This is to later facilitate Lucy impaling it on the ram's horns on the wall, giving Harry a 'devilish' look.
When Mary Jane tells Lucy her nail polish color is Abalone Pink, Lucy replies "Good! Then I can bite my nails on Friday." This refers to the fact that Catholics were supposed to abstain from eating meat on Fridays, abalone being shellfish popular in the waters off Southern California. Although this rule was relaxed and limited to Lent in 1966, many Catholics hung on to the practice for many years.
The script has Kim cast in a theatre production where she plays an incompetent secretary who messes everything up (not unlike Lucys Carter and Carmichael). Kim even imitates Lucy Ricardo's famously inflected "Well..." when thing don't go her way.