In 1974, Hot Wheels continued to release cars, but like previous years, focused on refining and continuing existing lines rather than launching entirely new ones. The lines active in 1974 include:

1. Mainline Series: The core Hot Wheels cars, featuring a wide variety of vehicle types.
2. Sizzlers (continuation): The battery-powered cars remained available in 1974.
3. Rrrumblers (continuation): The motorcycle series continued to be part of the Hot Wheels lineup.
4. Flying Colors: Introduced in 1974, this series featured bold, colorful decals and graphics on the cars, marking a distinctive style shift for Hot Wheels vehicles.

The Flying Colors line was notable for its vibrant, eye-catching designs, making it a standout introduction in 1974.