Michael Schur, co-creator of Parks and Recreation (2009), can be seen dining in the background of the scene where Leslie and Ben are having lunch in Paris.
The 99th episode of the series, as London: Part 1 (2013) and London: Part 2 (2013) are considered one episode.
In real life, Leslie would have needed to live in Dexhart's district longer than she said to be eligible to run in that district. Although, one can't be too sure because in Indiana, municipalities set their own rules for local office residency requirements. It is entirely possible that the Pawnee town charter allows for the shorter residency.
2 years later Adam Scott would appear in Kristen Bell's show the Good Place (2016).