SELECT "Written by" FROM table_74390 WHERE "Title" = 'Tricky Dick'
Who were the writers of the episode titled 'Tricky Dick'?
CREATE TABLE table_74390 (
    "No. in series" real,
    "No. in season" real,
    "Title" text,
    "Directed by" text,
    "Written by" text,
    "Original air date" text,
    "Production code" real
)