We got to see Sherlock's parents again (played by Cumberbatch's parents) and we got a nice flashback with Jim Moriarty (Andrew Scott).
The one person we didn't get a nod to was The Woman / Irene Adler (Lara Pulver) When asked about the connection between Sherlock and Irene, Steven Moffat told EW.com:
I have no reason to[...]
