In the opening, Morty puts a buttonless, short-sleeved shirt on his father. Jerry's arms, which are frozen (like everything else besides Rick, Morty and Summer) remain in a position that could not have gone through the armholes. Even with a shirt that buttoned, it would have taken several minutes to twist the arms through the sleeves. However, Morty just pulls the shirt straight down over Jerry's head, and the father is instantly properly clothed, in a couple of seconds.