Bill Bixby and Lou Ferrigno appeared on screen together 3 times during the run of the series. Once when Ferrigno played a body builder in the "King of the Beach". Another time was in The Incredible Hulk: Married (1978) during a dream sequence when Banner was trying to trap the Hulk. They also appeared together in The Incredible Hulk: Metamorphosis (1979), where the Hulk was tripping on acid and imagined a microphone stand to be David - Lou is clearly seen carrying Bill Bixby above his head.
When Mandy gives Carl a pep talk about winning the King of the Beach contest, she tells him if he wins he can go on to bigger things. She mentions Mr. West Coast, Mr. America, Mr. Olympia as possible contests he could win. The biggest body building contest is Mr. Universe. Lou Ferrigno, the actor who plays Carl Molina, won the Mr. Universe title two years in a row.