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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.
| Bowery Bombshell | 1946 | · | 460 | Writer | as Terence Aloysius 'Slip' Mahoney |
| In Fast Company | 1946 | · | 382 | Writer | as Terence Aloysius 'Slip' Mahoney |
| Live Wires | 1946 | · | 486 | Writer | as Terrence 'Slip' Mahoney |
| Spook Busters | 1946 | · | 592 | Writer | as Slip Mahoney |
| Bowery Buckaroos | 1947 | · | 371 | Writer | as Slip Mahoney |
| Hard Boiled Mahoney | 1947 | · | 392 | Writer | as Slip Mahoney |
| News Hounds | 1947 | · | 373 | Writer, as John 'Bullfrog' Burke | as Terence J. Montgomery 'Slip' Mahoney |
| Angels' Alley | 1948 | · | 300 | Writer | as Terence 'Slip' Mahoney |
| Jinx Money | 1948 | · | 330 | Writer | as Terrence 'Slip' Mahoney |
| Smugglers' Cove | 1948 | · | 402 | Writer | as Terrence 'Slip' Mahoney |
| Trouble Makers | 1948 | · | 301 | Writer | as Slip Mahoney |
| Crazy Over Horses | 1951 | · | 307 | as Flynn, Writer | as Terence Aloysius 'Slip' Mahoney |
| Feudin' Fools | 1952 | · | 345 | Writer | as Terence Aloysius 'Slip' Mahoney |
| Here Come the Marines | 1952 | · | 297 | as Sheriff Benson, Writer | as Terence Aloysius 'Slip' Mahoney |
| Hold That Line | 1952 | · | 341 | Writer | as Terence Aloysius 'Slip' Mahoney |
| No Holds Barred | 1952 | · | 353 | Writer | as Terence Aloysius 'Slip' Mahoney |
| Jalopy | 1953 | · | 399 | Writer | as Terrence Aloysius 'Slip' Mahoney |