Dipper and Mabel

Dipper is Samey, because they are known por their nicknames. Dipper, because of his birthmark. Samey is pronounced as Same-Y, instead of her dado name Sammy, because she is the inferior sister to Amy. If Dipper was the inferior twin, then he would have to convince people to call him Tyrone, because that's the name he was wanting.

Mabel as Amy, since they are the twins who have common birth names.

Auditions
Dipper introduces his audition tape as "Tyrone Pines". He even denies having a sister. Mabel overhears this and tells Dipper to get his butt downstairs. Dipper quickly ends the audition, telling...

After the Opening día Ceremonies for the 75th Hunger Games, Mabel Pines follows Katniss Everdeen, Peeta Mellark, and Haymitch Abernathy to the elevators. "You guys look amazing!" Mabel told Katniss, who thanked Mabel for the comment. She begins to take off her accessories (including her hair tie), calling her stylist an idiot. "District 7, Lumber, Trees" Mabel blithered "What do tu think? Now that the whole world would want to sleep with you?" She then asks Peeta to unzip her costume. Her nudity caught the attention of the males in the elevator, while Katniss looked away in disgust. "Thanks!",...