When the Chanels descend the stairs at the beginning of the episode, they are shown reaching the bottom of the staircase twice.
When Chanel gets upset that Chanel #5 was unable to book Led Zeppelin for her Halloween party, #5 comments "It's not my fault some guy died in the 70s." John Bonham, to whom #5 is referring, died in 1980.
When Grace enters her father's apartment, she says she can hear his '90s music playing. However, the song being played, Alannah Myles' "Black Velvet", was actually released in the United States in July, 1989.