Clarification on the use of the term "object" in "How to load objects through placeholders"
RE: Drupal 7 Development Core Concepts > How to Add and Manipulate Pages With the Menu System
How to load objects through placeholders
In this video you are using the term "object" a lot, which is a bit confusing since your page_object_load example returns an array not an object.
I presume by 'object' you meant essentially a "data object" in the general sense. I know in Java an array is an object, but not in PHP.