Paris Berelc and Jack Griffo, who play Alexa and Dylan, have been dating since January of 2017.
Alexa & Katie (2018) is the third multi-camera sitcom produced by Netflix after The Ranch (2016), And One Day at a Time (2017).
In season 2 episode 1, Alexa wears a shirt that says "Paris" on it. In real life, the actress who plays Alexa has the first name Paris.
Katie changes her backpack from the first day of school. It was a blue small backpack on the first day they entered school. Now throughout she has a black backpack that she brings to school in season 1.