This is Linda Hunt's 199th episode, but her 200th appearance as Hetty Lange due to her appearance as the character in True Colors (2014). This counts the NCIS: Los Angeles episodes "Sans Voir" and "High Value Target/Belly of the Beast" originally broadcast in two hour, unsplit blocks as one episode each.
The episode title "Where Everybody Knows Your Name" may refer to the theme song from Cheers (1982), which centers on the patrons of a bar in Boston.