I think back then that was what Universal had. The movie had better effects but the Studio Tour used what you saw in the episode. It wasn't bad for its time.

Yes that was the real JAWS shark at the time.

This scene also has a very famous GOOF pointed out on this website's GOOFS section.

The Chalk circle is already on the back of Columbo's raincoat, yet it wasn't drawn on until later, when he's showing how a bullet hole would rise if your hands were up.