In Megan's last scene of this episode (starting at 40:30), she wears a white t-shirt with a large, red, five-pointed star on it (along with white panties). This outfit is identical to the one that model and actress Sharon Tate wore (albeit while also dowsed with water and holding a bow and arrow) in a 1967 photo shot for Esquire magazine. The daughter of that shoot's photographer recognized the outfit and tweeted Mad Men's costume designer, Janie Bryant, to ask if the photo of Tate had indeed inspired Megan's costuming, and Bryant tweeted back that it was "no coincidence." Two years after the Esquire photo shoot, Sharon Tate was murdered by the Manson Family.
The vintage maroon, crocheted jumper Megan wears as "Collette" is the identical outfit worn by actress Lorenza Izzo in Once Upon a Time... in Hollywood (2019).