Items at stores are given specific shelf locations. An item labeled with an "F" for freezer cannot just be put anywhere in the frozen department, for example.
Cheyenne and Mateo discuss Mateo's time as floor supervisor. Mateo was never actually the floor supervisor, he just hung his own picture on the wall and started telling others what to do but was never given the title or associated pay raise.
Garrett says that with all of the rules for being the "third" in Dina and Brian's relationship, he feels like he's buying a Gremlin. In Gremlins (1984), which Garrett is referencing, Mogwai came with a strict set of rules and would turn into Gremlins if some of them weren't observed. There were no stated rules for Gremlins.