This is the only episode in the entire series in which neither Jamie Chung nor Genises Rodriguez (Gogo and Honey Lemon's respective voice actresses) play a voice role due to their characters being absent in both segments.
"The MiSFIT" marks Wasabi and Fred's last absence (not counting their appearances in a photo alongside Gogo and Honey Lemon) while "Return to Sycorax" marks Gogo and Honey Lemon's last absence. These are also the last absences in the series as a whole.