Montgomery never saw the field at Penn State and has four years of eligibility remaining.
Shots of Penn State's student section, players walking out of the tunnel, and the drum major performing his pregame flip made the trailer.
Roberson transferred after two years with UConn.
Parsons played for the Nittany Lions in 2018 and 2019.
Fashanu will play for four years, earning $20,510,710 with a fifth-year option.
McClain's stop with the Sun Devils will be the third of his college career.