Ken the security guard acts as though he's never been in the "back of the house" (employee-only section, and the manager's office specifically) and asks if that's where they keep the cups. Ken was in the manager's office in Workplace Bullying (2017) when Glenn (unsuccessfully) attempted to fire him, and was subsequently seen in the employee break room after being reassigned from security to sales.
When Dina is going through (what she believes to be) Carol's purse, she pulls out a set of headphones and holds them up with one hand. When she pulls them out, she is gripping them near the ear buds, with the plug end dangling down, but when the camera angle changes, she is suddenly holding them by the plug end, with the ear buds dangling down.
When Jonah is attempting to convince a man not to eat at the sub shop, he reaches into his left jacket pocket. The angle changes and suddenly his hand is in his pants pocket instead.
When Sandra watches the security video of Carol being electrocuted, Carol falls in a different position than had been shown earlier. It is most evident in her right leg, which is straight in the video but was bent to the side when the event actually occurred.
When Carol is sitting in Amy's office, Amy gives her a large stack of reports and a highlighter to work on. The papers and highlighter can still be seen in shots focusing on Amy (where only Carol's back is visible), but in shots focusing on Carol they are completely missing.
Amy says there is nothing she can do to fire Carol. While it is illegal to fire someone for health reasons, Missouri, where the show is set, is a so-called "right-to-work" state, meaning an employer can terminate an employee for nearly any cause, or no cause at all.
After tweaking his back, Hank asks if he can have a lifting support belt, to which Mateo and Garrett reply mockingly. It has been proven that lifting support belts do not actually protect or support any part of the body. Retailers that still use them have long since amended their training materials to remove any claims to that effect, instead saying that the belts help remind associates to use proper form when lifting.
When Amy gives Carol a stack of papers and asks her to highlight them, Carol asks what she should highlight and, after saying "whatever seems important," suggests Carol highlight "the verbs." The papers are a series of spreadsheets. There are no verbs on spreadsheets, just column headers and numbers.