One of the episodes filmed without Bea Benaderet as illness gradually forced her to exit from the series.
An "Apple polisher" is an idiomatic expression meaning someone who uses flattery.
Betty Jo's (Linda Henning) bookkeeping has (erroneously) them "in the black" (showing a profit) of $100.00. That would be the equivalent of about $826.00 in the year 2022.
Bobbi Jo (Lori Saunders) tells Betty Jo (Linda Henning) that Mr. Marshall's little girl, Millicent (Joi Lansing), is 38.....38-24-36, referring to her age, then body measurements (bust, waist, hips). When this episode aired Joi Lansing was 37 years old and her measurements were 39-23-35.
A paper that appears to be Steve and Betty Jo's marriage license shows a date of June 7, 1967, which fell on a Wednesday.