When Hooper visits Brody's home, he brings two bottles of wine. Brody pours himself a large measure, and then gives his wife and Hooper some. If you look at the bottle, firstly it seems rather full for the amount he's just poured, and secondly the level changes from shot to shot. Sometimes it's above the label, sometimes below.
The purpose of an Essay Introduction is to introduce the reader to the subject matter you are writing about and to state the intent of the paper.
What is the purpose of a foreword in a book? The purpose of a foreword in a book is to introduce the author or topic and encourage the reader to finish the book. A foreword is not written by the author of the book.