First, the melody is replaced with the melody of "Star Wars (Main Title)", the main musical theme of the Star Wars franchise. Then, the melody switches back to the original and it turns into a mashup of "Once Upon a Time" and "Star Wars (Main Title)". At the end, the melody is replaced with the melody of "Meet the Flintstones".
There were two other high quality rips of "Once Upon a Time", the first published sometime on or before February 28, 2016 and the other published on July 21, 2016. The first was lost after the original channel was shut down and the second has been unlisted. The first was just the current rip without "Meet the Flintstones". The second had the Nutshack theme playing as the song faded out.