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Shared credits
John Harron averages 6.48, Jack Mower averages 6.67. Apart that suggests 6.58; together they average 6.50, a lift of −0.07.
Lift is the average of their films together minus the mean of their two career averages.
Dot size shows audience votes; lines are rolling five-film averages. Films below the source vote floor are left out.
| 1937 | 6.6 | 80 | as Cabbie #1 (uncredited) | as Jury Foreman #2 (uncredited) | |
| The Go-Getter | 1937 | · | 5 | as Country Club Man #1 (uncredited) | as Ricks' Radio Man (uncredited) |
| 1937 | 7.1 | 61 | as Fred (uncredited) | as Man with Clippings for Fluff (uncredited) | |
| Public Wedding | 1937 | · | 4 | as Reporter | as Reporter |
| Mr. Dodd Takes the Air | 1937 | · | 9 | as Man in Sound Booth (uncredited) | as Policeman (uncredited) |
| Varsity Show | 1937 | · | 9 | as Clerk | as Desk Sergeant (uncredited) |
| The Man Without a Country | 1937 | · | 12 | as Minor Role (uncredited) | as Minor Role (uncredited) |
| The Patient in Room 18 | 1938 | · | 9 | as Thatcher Hospital Orderly (uncredited) | as Policeman Picking Up Radium at End (uncredited) |
| The Invisible Menace | 1938 | · | 12 | as Pvt. Murphy | as Sgt. Peterson |
| He Couldn't Say No | 1938 | · | 4 | as Man With Street Radio Reporter | as Detective Driving Car |
| The Beloved Brat | 1938 | · | 9 | as Second Cab Driver | as Fireman |
| Torchy Blane in Panama | 1938 | · | 8 | as Aviator | as Ship's Officer |
| Cowboy from Brooklyn | 1938 | · | 2 | as Technician | as Radio Station Manager |
| Racket Busters | 1938 | · | 16 | as Allison's Stenographer (uncredited) | as Plainclothesman (uncredited) |
| 1938 | 7.0 | 62 | as Alarm Company Operator (uncredited) | as Second Detective (uncredited) | |
| Hard to Get | 1938 | · | 6 | as Orchestra Leader (uncredited) | as Schaff |
| Torchy Gets Her Man | 1938 | · | 8 | as John Wilkins (uncredited) | as Police Officer Shane (uncredited) |
| 1939 | 6.4 | 27 | as G-Man (uncredited) | as G-Man (uncredited) | |
| 1939 | 6.3 | 40 | as First Fight Radio Announcer (uncredited) | as Man in Locker Room After First Fight (uncredited) | |
| Torchy Blane in Chinatown | 1939 | · | 4 | as Chauffeur (uncredited) | as Bill (uncredited) |
| 1939 | 6.0 | 35 | as President Cleveland's Secretary (uncredited) | as Mail Clerk on Train (uncredited) | |
| Secret Service of the Air | 1939 | · | 6 | as Agent Cliff Durell | as Treasury Agent Aldrich |
| You Can't Get Away with Murder | 1939 | 5.8 | 26 | as Convict Remaining in Cell (uncredited) | as Keeper Monahan (uncredited) |
| Women in the Wind | 1939 | · | 5 | as Process Server (uncredited) | as Salesman (uncredited) |
| 1939 | 6.9 | 165 | as George, the Man Taking Judith's Coat (uncredited) | as Veterinarian (uncredited) | |
| 1939 | 6.1 | 34 | as Man in Montage with Propaganda (uncredited) | as FBI Agent 'Mac' MacDonald (uncredited) | |
| Code of the Secret Service | 1939 | · | 7 | as Gambler Paid in Silver (uncredited) | as Decker |
| Naughty but Nice | 1939 | · | 8 | as Freddie, Court Clerk (uncredited) | as Professor Listening to Radio (uncredited) |
| Torchy Blane... Playing with Dynamite | 1939 | · | 5 | as Motorcycle Policeman | as Arresting Officer #2 (uncredited) |
| Angels Wash Their Faces | 1939 | · | 9 | as Reporter (uncredited) | as Policeman at Accident (uncredited) |
| Espionage Agent | 1939 | · | 10 | as American Tourist | as Man Opening Door |
| Smashing the Money Ring | 1939 | · | 4 | as Reporter at Trial (uncredited) | as First Night Guard |
| 1939 | 7.5 | 277 | as Soldier (uncredited) | as Guard (uncredited) | |
| Kid Nightingale | 1939 | · | 4 | as Clipper (uncredited) | as Dan - the Guard (uncredited) |
| On Dress Parade | 1939 | · | 5 | as Academy Officer Investigating Fracas (uncredited) | as Soldier Reporting Blues at H5 (uncredited) |
| 1939 | 6.0 | 64 | as Reporter (uncredited) | as Policeman Guarding Rodgers' Room (uncredited) | |
| 1940 | 6.3 | 41 | as Union Lieutenant (uncredited) | as Outpost Officer (uncredited) | |
| Tear Gas Squad | 1940 | · | 8 | as Taxi Driver | as Officer |