Nothing to be concerned about.

Cars are often damaged or blown up during races, implying their drivers die.

Speed occasionally steps out of the Mach 5 and, in self defense, picks up a nearby gun (usually a Thompson) and fires it at hordes of bad guys. Other uses of guns throughout the series also occur.

Speed exasperatedly blurts out a "damn" in one episode. Dialogue is otherwise pretty clean.

Numerous characters both major and minor are shown smoking cigarettes/cigars and drinking wine or whiskey throughout the show's run.

In one episode, Trixie has a nightmare where Speed turns into a blue-skinned demon with sharp teeth.