Wow. Just... wow. I knew I didn't imagine it! This page is still burned into my brain 30 years later. It's perhaps solely responsible for making me an Indy fan. At 8 I tried my hand at a "Freighters of the Lost Shark" parody (made it as far as the Raven scene, hopefully I'll dig up a copy someday) and realized I needed the videotape.
And by R.L. Stine and Sam Viviano! Who later did Mad's Last Crusade cover. Sometimes I wonder if we'll ever track down all the parodies. After Mad's circulation reached 2 million in 1974, there were so many. Not sure if this is Dynamite (1974-1992) or Bananas (1975-1984), they each worked for both. Is it the original coloring?