Although the Arlen Bystander has gone through a management/distribution change, Peggy has worked there before and knows Jenkins personally as seen in a previous episode S9 Ep.12 "Smoking and the Bandit" where Peggy doesn't cover her beat for the Bystander at the Waffle House, and so Jenkins gets the story of the "bandit" himself, much to her chagrin. Peggy should know Jenkins and be familiar with the Bystander by now. This episode should have aired earlier in the series.
When Kahn and Minh compete at solving the New York Times crossword puzzle Minh is wearing no earrings except in the closeup of her face, when she suddenly has large round purple earrings.
Mixing ammonia and bleach will not produce mustard gas, which is a common misconception, as mustard gas requires a more complicated process. However, it will produce the equally toxic chloramine, a very toxic chlorine gas. Whatever it is, DO NOT MIX two household cleansers together!
Or, "animator error". The Hills are eating at Luly's and have menus with "Luly's" on the cover. After a woman stops to talk to Peggy Hank's menu says "Lul's".