Jeremy Renner , who plays Penn in this episode , went on to play Hawkeye in Joss Whedon 's The Avengers .
Joss Whedon himself did n't cast Jeremy Renner in either role .
Jeremy Renner , who plays Penn in this episode , went on to play Hawkeye in Joss Whedon 's The Avengers , although Whedon himself did n't cast him in either role .