Throughout most of Glee, it is widely known that Rachel is a vegan, but in this episode she is seen sharing a pizza, which Finn says has pepperoni on it.
When she talks with Finn after learning of Quinn's pregnancy, Rachel says that, on their 'date' at the bowling alley, she let him kiss her, but she was the one who initiated the kiss.
While having a conversation with Emma about bringing April Rhodes back, Will states to Emma that "she was only three credits shy of graduation," and he later references that she only needed the Spanish class to graduate. Unlike the college and university level, most high schools do not issue more than one credit for each class.