Hi,
I have browsed thru Paramount´s official synopses and guest star list for Family Ties, and it seems like you´re right.
At least, the list says that Hank Azaria did appear in the episode "Designing Woman".
If I can be of any further help to you, please let me know.
Sincerely,
Daniel Hofverberg
Webmaster, Family Ties Home Page
http://www.familyties.f2s.com