TV shows that reference the past

I worded that title wrong, anyways I like when tv shows or actors in a tv show make a subtle or blatant nod to their past. 2 good examples are girl meets world and last man standing. Last man standing stars tim allen and he has 3 daughters. In one episode he needed a new partner at his job when one of his potential clients was richard karn aka al borland from home improvement. They are old friends on the show and richard mentions that "it's been way too long". On his way out he also says "say hi to the wife and 3 boys" and of course it warmed my heart. On another episode johnathan taylor thomas guest starred as the boyfriend of one of tim's daughters. Tim in a nod to the past says "boy you look familar" meanwhile he got huge applause from the studio audience.  Girl meets world is a sequel to boy meets world. It is about corey and topanga living in new york while raising their daughter.  In the first episode there is a mr feeny poster and he appears as a figment of corey's imagination and then I got something in my eye. Shawn hunter and minkus have also appeared. Corey's brother eric is also scheduled to appear. I like how these shows are geared towards kids but they also don't forget about us adults that watched them when we were kids