Oooh yes I remember! I too was puzzled because the sudden changes in the 3rd line didn't seem to fit the piece at all. And my book showed it as "normal". Then I compared with the free downloadable version and mine was entirely different. Kudos for trying to play it as written in the uncorrected version - that's actually a lot harder!
I just had a peek at book 2 which starts with an adorable yodeling exercise (no, not by voice, I. Do. Not. Sing. Be glad of thatπ). I'm still wrapping up Alfred 3, and then I can get at it in full swing. Looking forward to it!