Carrie Kemper who plays Jan's secretary Mollie is the younger sister of Ellie Kemper (Erin).
The table in Jan's office has a Serenity by Jan candle on it, which was the candle company Jan started when she was living with Michael.
Pam says she and Jim believe Jan had an affair with her assistant Hunter, who was 17 at the time. Nicholas D'Agosto, who played Hunter, was 26 when he appeared on The Office.
Erin appears to misinterpret "No Woman, No Cry," but the joke is on the writers: The intended meaning is "No, woman, don't cry," not "Women cause men to cry."