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Shared credits
Dot size shows IMDb votes; lines are rolling five-film averages. Films with fewer than 1,000 votes are left out.
| Live Wires | 1946 | · | 486 | as Terrence 'Slip' Mahoney | Writer |
| In Fast Company | 1946 | · | 382 | as Terence Aloysius 'Slip' Mahoney | Writer |
| Bowery Bombshell | 1946 | · | 460 | as Terence Aloysius 'Slip' Mahoney | Writer |
| Spook Busters | 1946 | · | 592 | as Slip Mahoney | Writer |
| Hard Boiled Mahoney | 1947 | · | 392 | as Slip Mahoney | Writer |
| News Hounds | 1947 | · | 373 | as Terence J. Montgomery 'Slip' Mahoney | as John 'Bullfrog' Burke, Writer |
| Bowery Buckaroos | 1947 | · | 371 | as Slip Mahoney | Writer |
| Angels' Alley | 1948 | · | 300 | as Terence 'Slip' Mahoney | Writer |
| Jinx Money | 1948 | · | 330 | as Terrence 'Slip' Mahoney | Writer |
| Smugglers' Cove | 1948 | · | 402 | as Terrence 'Slip' Mahoney | Writer |
| Trouble Makers | 1948 | · | 301 | as Slip Mahoney | Writer |
| Crazy Over Horses | 1951 | · | 307 | as Terence Aloysius 'Slip' Mahoney | Writer, as Flynn |
| Hold That Line | 1952 | · | 341 | as Terence Aloysius 'Slip' Mahoney | Writer |
| Here Come the Marines | 1952 | · | 297 | as Terence Aloysius 'Slip' Mahoney | Writer, as Sheriff Benson |
| Feudin' Fools | 1952 | · | 345 | as Terence Aloysius 'Slip' Mahoney | Writer |
| No Holds Barred | 1952 | · | 353 | as Terence Aloysius 'Slip' Mahoney | Writer |
| Jalopy | 1953 | · | 399 | as Terrence Aloysius 'Slip' Mahoney | Writer |