this is during the middle of episode 12, on their break. There's a reporter talking to Nanami

Reporter: "Tonight you're shooting some quite gloomy scenes. How's the mood on set?-"

Junpei was on the transformed version of himself, having a proud smile on his face. "WHO WANTS A RIDE ON POTATO ME?"

Yuji: excitedly runs over "POTATO JUNPEI!!!"

Mahito: Shoves Yuji "LET ME BE IN THE FRONT SEAT THIS TIME"

Sukana: "NO IT'S MY TURN"

Gojo: watching out the window "Hehe..."

Nanami: he then smirked at the reporter "Oh they're just fine"