'Best Friends': E. Thomas Case

Thomas Case, Jr. (1 unconfirmed):
Brute Corps

Thomas Case (2 confirmed, 1 invalid):
The Karate Kid invalid
Protocol (confirmed by AiAustria)
Swing Shift (confirmed by AiAustria)

E. Thomas Case (7 confirmed, 1 unconfirmed, most invalid):
Romancing the Stone (confirmed by T!M)
Best Friends (confirmed by T!M)
Serial Mom invalid
Career Opportunities (confirmed by ninso4)
Swing Shift invalid
The First Wives Club (confirmed by AiAustria)
Everybody’s All-American
Undercover Blues invalid
V.I. Warshawski (confirmed by Sidrat)
The Doors invalid
Tales From the Crypt: Season 1 (confirmed by bigdaddyhorse)
Prizzi’s Honor invalid
The Karate Kid invalid
Overboard invalid
Death Becomes Her invalid
Peggy Sue Got Married (confirmed by T!M)
Protocol invalid
Heartbreak Ridge invalid

Tom Case (18 confirmed, 4 unconfirmed):
Bird on a Wire (confirmed by AiAustria)
The Jewel of the Nile (confirmed by T!M)
The Babe
Dead Men Don’t Wear Plaid (confirmed by AiAustria)
Overboard (confirmed by T!M)
Cross My Heart (confirmed by AiAustria)
Death Becomes Her (confirmed by AiAustria)
The Doors (confirmed by bigdaddyhorse)
Dynasty: Season 5
Prizzi’s Honor (confirmed by Kluge)
Heartbreak Ridge (confirmed by AiAustria)
Housesitter (confirmed by T!M)
Foul Play (confirmed by T!M)
The Man With Two Brains (confirmed by T!M)
The Karate Kid (confirmed by Gamemaster)
Serial Mom (confirmed by SoylentDave)
That Girl: Season 1
That Girl: Season 4
Private Benjamin (confirmed by AiAustria)
Promises in the Dark
Seems Like Old Times (confirmed by T!M)
Shampoo (confirmed by T!M)
Undercover Blues (confirmed by T!M)


Updated as much as I could, think it's safe to call Tom Case the winner now.