Incorrect Dialogue Text in Lesson 3.1 of Advanced

In the lesson 3.1 dialogue, the accompanying text is incorrect. It is written as follows for Maurcio's part toward the end: No sabía si debía seguir adelante o *al revés*. It should read: No sabía si debía seguir adelante o *retroceder*. I'm still trying to dig up the idiomatic usage of retroceder. I haven't run across it yet in the printed materials. Also missing nearer the beginning, in Maucio's part, marked in bold text below: Pero otra vez, la mala suerte, *me perdí*. Greg