Heh, I knew you’d catch that, Donnie. 
So Chuck Norris was in Sidekicks with Jonathan Brandis who was in It which was directed by our beloved Tommy Lee Wallace. I’m sure there are other avenues, but this was the first one that came to mind.
Steve Buscemi
buscemi was in fargo with william h. macy. macy was in wild hogs with travolta. travolta was in carrie with pj soles who was in the original halloween.
how bout will farrel?
Will Farrel was in Anchorman with Paul Rudd who was in h6 with the shape.
Sigourney Weaver
sigourney weaver was in holes with john voit. jon voit was in national treasure with nik cage. nik cage was in face off with travolta who worked with pj soles in carrie.
(sorry to repeat the travolta/soles connection)
chris rock?
Chris Rock was in jay and silent bob strike back with will farrel who we already did.
Tom Cruise
well in that case I could just say cruise was in jerry mcguire with zelweger and someone already did her connection, but I will try an alternate route to keep it fun
cruise was in war of the worlds with dakota fanning. fanning was in uptown girls with brittany murphy who had been featured in clueless with paul rudd.
reese witherspoon
Reese was in Sweet Home Alabama with Courtney Gains, Courtney was in RZ’s HALLOWEEN.
Lon Chaney Jr.
Lon Chaney Jr. was in drac vs frank with Forrest Ackerman who was in the howling with Dee Wallace who was in RZ Halloween.
Robert Englund
both robert englund and danielle harris were in urban legend. 
michael cera
Michael Cera - Superbad - Seth Rogan - 40 yr old Virgin - Paul Rudd - h6
Harrison Ford
I got this one
Harrison Ford - BLADE RUNNER - Daryl Hannah
Daryl Hannah - WALL STREET - Hal Holbrook
Hal Holbrook - THE FOG - Jamie Leigh Curtis/Charles Cyphers/Nancy Loomis (Kyes) ← take your pick! 
Next up: Halle Berry
Halle Berry–in X-Men with Anna Paquin
Anna Paquin–in Almost Famous with Phillip Seymour Hoffman
PSH–in Twister with Bill Paxton
Bill Paxton–in Frailty with Matthew McConaughey
Matthew McConaughey–in Dazed and Confused with Sasha Jenson
Sasha Jenson–in Halloween IV
Or the no fun way: Halle Berry in X-Men with Tyler Mane. One step.
Sally Field
Sally Field was Forrest Gump with Hannah Hall (who played the young Jenny). Hannah went on to play Judith Myers in Rob Zombie’s Halloween.
How about Judd Nelson?
Judd Nelson —> Adam Sandler - Airheads
Adam Sandler —> Winona Ryder - Mr. Deeds
Winona —> Brittany Murphy - Girl, Interrupted
Britney —> Paul Rudd - Clueless
Paul was in H6.
Dom DeLuise 
Dom DeLuise was in Cannonball Run 2 along with Adrienne Barbeau, who was in The Fog, directed by John Carpenter, starring Jamie Lee Curtis and Nancy Loomis ala Halloween. huzzah.
OK, Gary Coleman.
Coleman guest starred in an episode of The Fresh Prince with Will Smith. Smith starred in Hancock and featured Daeg Faerch who played the young Myers in Rob Zombie’s Halloween.
Dwayne Johnson (the Rock)
The Rock - Sean William Scott (The Rundown)
Sean William Scott - Paul Rudd (Role Models)
Paul Rudd - H6
How about Howard Stern? 
Howard Stern - Paul Giamatti = Private Parts
Giamatti - Bob Balaban = Lady In The Water
Balaban - Parker Posey = Best In Show
Posey - Sasha Jenson = Dazed and Confused
Jenson - HALLOWEEN 4
Dustin Diamond
Dustin Diamond - Fred Savage (Wonder Years)
Fred Savage - Michael Myers (Austin Powers 3) wait…
Dustin - Fred
Fred Savage - James Van Der Beek (Rules of Attraction)
James Van Der Beek - Michelle Williams (Dawson’s Creek)
Michelle Williams - H20
Linnea Quigley!