The Legend of the Gobblewonker (Season 1, Episode 2) Credits Code

Okay, first off, uh...you probably know about the credits codes by now...so, uh...let's get started! Okay, again, first off, again, the code letters read, "QHAW ZHHN: UHWXUQ WR EXWW LVODQG". When decoded with method #1 (Caesar method or Three Letters Back rule), it says, "NEXT WEEK: RETURN TO BUTT ISLAND" because when Mabel, Dipper, and Soos traveled to Scuttlebutt Island, Soos put his arm over the sign that said, "SCUTTLEBUTT ISLAND", but only put his arm over the part that said, "SCUTTLE", so it only said, "BUTT ISLAND".
Code: NEXT WEEK: RETURN TO BUTT ISLAND
Method #1

We're still beavers!

Ah! Bird!