Instead of Pam's painting of the office building on the wall there is a "demotivational" poster of a golf course reading "Failure is always an option".
In the previous episode Koi Pond (2009), Michael mentions that he has fallen into the fountain at the Steamtown Mall. In his scrapbook for Helene, Michael includes a penny that Helene had thrown into that same fountain and says that he waded in the fountain to retrieve it. It can be inferred that this is the instance in which Michael fell.
When Michael wrongly adds up the math for Helene's age, he states that she is 54 years old, to which she replies that she is 58. Actress Linda Purl was indeed 54 at the time of filming.
In the episode "Broke" Pam states that she is 30. In this episode it is revealed that her mother is turning 58. That means Pam's mother was 27 when Pam was born.