- The picture that the carolers show to Stan of the Holiday (or Christmas) Rapist is the elf who photographed Hayley and Steve sitting on Santa's lap.
- The patron with crabs at Mentally Deficient Young Women in "Stan Knows Best" is seen in line at Elaine's and at the theater with the revised version of Taxi Driver with John Wayne.
- Roger pays a sample of "The Hustle" by Van McCoy for Clive Davis.
- Roger's party features "That's the Way (I Like It)" by KC and the Sunshine Band.
- During the flashback on how the present was changed, Hinckley's last name is misspelled on the name of his ice cream business. It is misspelled as "Hinkley".
- In 1970, Roger is asked about his audition for Ryan's Hope by a fellow employee at Elaine's, but Ryan's Hope didn't premiere until 1975.
- Michelle takes Stan back to Christmas 1970 and causally mentions Jane Fonda is filming her Oscar Award winning film, Klute, which causes him to run off to find her. However, Klute wrapped filming on September 11th, 1970.
- According to the DVD commentary, Jane Fonda, Donald Sutherland and Martin Scorsese were offered the opportunity to voice themselves only for all three to decline.
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