When Jerry first brings Lil' Sebastian into the office, it cuts to everyone's excited reaction, and then cuts to Jerry bringing the horse back into the room a second time.
Jerry's mother's diary says his name is Gerald, indicating his nickname Jerry is in fact the correct one, but later in The Trial of Leslie Knope (2011) he admits to the gang his real name is Garry and he never had the guts to correct them.
Ken says "calvary" when he should have said "cavalry."
When Leslie says "Hello, honored guest," she pronounces hello as "wa-la-ho", and when Ken replies he pronounces hello as "wa-ha-lo".