Cramer's 'Mad Money' Recap: Slim's Pickins

"Follow Slim on this one," he said. "Even though there's nothing respectful about being a copycat ... let's start copying the best guy with the best stock ... Carlos Slim."

Green Day IV

On "Green Day," April 2, the Supreme Court changed the rules when it gave the Environmental Protection Agency and states the go-ahead to be stricter on polluters, Cramer told viewers.

As part of his week-long Green Day series, Cramer added Tetra Tech (TTEK Quote) to his green picks.

Tetra, he said, has been expanding into alternative energy. But at its core, Tetra is a water company, "geared towards the scarcity of clean water," Cramer said. "It is one of the ways we can play the extremely high price of water."

The fact that 85% of the company's revenue comes from water management and that Tetra just purchased Delaney Group, "a little wind company," puts it in the "sweet spot" for Green Day, Cramer said.

Sell Block

In a special "Sell Block" segment, Cramer looked at the most popular stocks in CNBC's Million Dollar Portfolio Challenge game.

Cramer said that some of the most famous stocks being invested in the game are small, speculative stocks. He reminded viewers that speculative stocks are good, but only when they're part of a well-balanced portfolio.

Charter Communications (CHTR Quote), Cramer said, is the only speculative stock he would buy. "The cable business is on fire," he said. "I could see [Charter] going to $4."

Charter closed at $3.28 Thursday.