Meathead

The bully from Jack's childhood was portrayed by Sev Palmer

in the Season 1 episode "White Rabbit".

I haven't been able to locate an address for Mr. Palmer

to request an autograph. The episode of LOST is his only 

credited acting role to date.

Matthew Reed

Matthew Reed was portrayed by Rick Overton in the 

Season 2 episode "Collision".

I have written to Mr. Overton, requesting an autograph.

I'll update this post if/when I receive a response.

Mathias

Mathias was portrayed by Len Cordova in the Season 2 episode

 "Live Together, Die Alone".

(He cleans up NICELY!)

I have written to Mr. Cordova, requesting an autograph.

I'll update this post if/when I receive a response.

Mary Jo

Mary Jo was portrayed by Brittany Perrineau

in the Season 1 episode "Outlaws" and the

Season 2 episode "Everybody Hates Hugo".

Brittany Perrineau is the wife of Harold Perrineau

who portrayed Michael Dawson.

I have written to Mrs. Perrineau, requesting an autograph.

I'll update this post if/when I receive a response.

Martha Toomey

Martha Toomey was portrayed by Jane Taini

in the Season 1 episode "Numbers".

I have written to Ms. Taini, requesting an autograph.

I'll update this post if/when I receive a response.

Margo Shephard

Jack's mother was portrayed by Veronica Hamel.

Inkworks LOST Revelations Autograph card

Mark Hutton

Mark Hutton was portrayed by Tim Halligan in the Season 1

episode "Whatever the Case May Be".

I have written to Mr. Halligan, requesting an autograph.

I'll update this post if/when I receive a response.