Continuity: When Andy and Barney are looking through the yearbook, Barny's middle name is Milton. But Barney says many times throughout the series that his name is Bernard P. Fife.
Great sites
Class Reunion (season 3, episode 19)
You may also like: And Justice for All | E.T. the Extra-Terrestrial | The Rocky Horror Picture Show | The Big Bang Theory | High School Musical 3: Senior Year
reddit
Facebook