Not really something that makes you wonder but...
I was flipping through channels while eating lunch today and for a few minutes watched an episode of Murder, She Wrote entitled The Great Twain Robbery. I immediately recognized two actors who were on TNG.
Hallie Todd (Lal, from The Offspring)
James Sloyan (Adm Jarok, from The Defector)
Could be a fun game, Spot the TNG guest stars on other shows
I'll continue, here are actors from different Star Trek series that I've noticed in Murder, She Wrote.
Q – John de Lancie
Hikaru Sulu - George Takei
Geordi La Forge - LeVar Burton
Odo – Rene Auberjonois
Captain Janeway – Kate Mulgrew
Chakotay – Robert Beltran
Tom Paris – Robert Duncan McNeill
Elim Garak – Andrew Robinson
Worf's father Sergey Rozhenko – Theodore Bikei (TNG – Family)
Rutian police chief Alexana Devos – Kerrie Keane (TNG – The High Ground)
William Riker's father Kyle Riker – Mitchell Ryan (TNG – The Icarus Factor)
Malcor III chancellor Avel Durken – George Coe (TNG – First Contact)
Admiral Alynna Nechayev – Natalia Nogulich (TNG – Chain of Command part 1)
”Fake” emissary Akorem Laan – Richard Libertini (DS9 - Accession)
General Krim – Stephen Macht (DS9 – The Circle)
Tahna Loss – Jeffrey Nordling (DS9 – Past Prologue)
Simon Tarses – Spencer Garrett (TNG – The Drumhead)
Data's ”mother” Juliana Tainer – Fionnula Flanagan (TNG - Inheritance)
Ardra – Marta Dubois (TNG – Devil's Due)
Admiral Leyton – Robert Foxworth (DS9 – Homefront)
Mirasta Yale – Carolyn Seymour (TNG – First Contact)
Michael Webb - Bill Smitrovich (DS9 – Past Tense)
Unnamed car driver - Christopher Curry (VGR – 11:59)
Lieutenant McNary – Gregory Itzin (TNG – The Big Goodbye)
Professor Galen – Norman Lloyd (TNG – The Chase)
Admiral Alidar Jarok - James Sloyan (TNG – The Defector)