There doesn't seem to be a list by actor so I copied the all character list and sorted. I left out the ones where the main characters had analogs in the soul mate/time travel stories.
Mr. Tracewski
Episode: 114
Played By: Brian George
Notes: Lois's landlord
Misha
Episode: 422
Played By: Brian George
Notes: Sam Lane's assistant/partner
John Cosgrove
Episode: 113
Played By: David Sage
Dr. Golden
Episode: 219
Played By: David Sage
Mrs. Lopez
Episode: 413
Played By: Irene Olga Lopez*
Notes: Hispanic maid
Beckett
Episode: 421
Played By: Irene Olga Lopez
Newspaper Worker
Episode: 101
Played By: Jean Montanti
Notes: Dark-haired woman in far background
Scientist
Episode: 204
Played By: Jean Montanti
Notes: Probably one of the people gassed in the plant
Grandma
Episode: 106
Played By: Jean Speegle Howard
Bertha Emery
Episode: 409
Played By: Jean Speegle Howard
Notes: Lois & Clark's neighbor
Soldier #2
Episode: 103
Played By: Jeff Austin
Phil
Episode: 111
Played By: Jeff Austin
Frank James
Episode: 218
Played By: Joshua Devane
Agent Roberts
Episode: 315
Played By: Joshua Devane
Schlomo
Episode: 220
Played By: Kelly Christian
Richie
Episode: 304
Played By: Kelly Christian
Alan Morris
Episode: 105
Played By: Leslie Jordan
William Wallace Webster Walldecker
Episode: 208
Played By: Leslie Jordan
Notes: AKA Resplendent Man
Max Menken
Episode: 106
Played By: Matt Roe
Edward Hanson
Episode: 418
Played By: Matt Roe
Notes: the Shadow
Judge
Episode: 205
Played By: Michael Holden
Detective
Episode: 417
Played By: Michael Holden
Miss Bird
Episode: 116
Played By: Myrna Niles
Older Woman
Episode: 220
Played By: Myrna Niles
Mr. Sunshine
Episode: 217
Played By: Oliver Muirhead
Manager
Episode: 315
Played By: Oliver Muirhead
Louie
Episode: 117
Played By: Robert Costanzo
Gun Salesman
Episode: 218
Played By: Robert Constanzo ** typo should be Costanzo
Maisie
Episode: 109
Played By: Sharon Thomas
Notes: Smallville waitress
Pretentious Lady
Episode: 209
Played By: Sharon Thomas
Nun
Episode: 305
Played By: Sharon Thomas
Security Guard
Episode: 203
Played By: Stan Sellers
Notes: off screen
Security Guard, Viologic
Episode: 204
Played By: Stan Sellers
Detective Burke
Episode: 105
Played By: Thomas Ryan
Detective Ryder
Episode: 201
Played By: Thomas Ryan
Businessman
Episode: 104
Played By: Wil Albert*
Delacroix
Episode: 119
Played By: Wil Albert*
