Angry Guard Dog: Jimmy is initially completely safe inside the Playsafe Suit Double D improvised for him, but he unfortunately lands right into a backyard with an angry dog, which chews open a hole in the suit, sending Jimmy helplessly flying away.
Attention Whore: The plot kicks into action because Eddy is jealous of Jimmy's injuries stealing attention away from him,
Bad "Bad Acting": When Eddy is faking an injury to gain attention, Double D plays along with it as an actor, but he clearly phones in his performance.
Butt-Monkey: Jimmy breaks his foot by getting a tiny clothespin dropped on it, gets crushed under a tree (implied to have been knocked down by a squirrel), and then gets sent flying off helplessly when a dog chews a hole into his Playsafe Suit.
Here We Go Again!: Just when the kids think Jimmy is safe from injury inside Double D's Playsafe suit, he falls right into a backyard with a dog, tearing a hole in it and sending him flying away, with the kids tailing right behind.
Made of Plasticine: Zigzagged; Jimmy gets his foot broken by a clothespin falling onto it. But later on, he gets completely crushed under a tree, and eventually recovers despite some more injuries.
Made of Iron: Jimmy gets crushed under a large tree and survives. Eddy gets an entire house dropped on him, courtesy of Ed, and comes out intact.
Subverted with Eddy's "Better Than Jimmy's Playsafe Suit". At first it seems impenetrable, but Rolf is able to split it open by simply hitting a spot on it that had shoddy spot welding.
Oh, Crap!: Eddy and Double D have this reaction when they see Ed lifting a house in front of them, about to drop it down on Eddy. Double D high tails it, while Eddy gets crushed.
Eddy is initially cocky that his improvised Playsafe Suit will protect him from Kevin and Rolf, but when Rolf quickly breaks open the suit, Eddy whimpers like a puppy dog as they prepare to thrash him.
Screwy Squirrel: While Jimmy is resting on a lawn chair, he notices a squirrel off screen. The next time we see Jimmy, he's crushed under a tree, and it's implied the squirrel somehow knocked it down onto him.
Super Strength: Ed lifts an entire house off its foundation and drops it onto Eddy so he can really be injured.