Trivia: Ted Cassidy, best known for his role as Lurch in the hit TV series "The Addams Family", did the opening narration for the show as well as the vocal effects for the Hulk. Sadly, Ted Cassidy died during production of Season 2. The Hulk's vocal effects were then done by actor Charles Napier for the rest of the show. Ted Cassidy's voice was still used for the opening narrations of all seasons.
Trivia: Bill Bixby refused to let his son watch the show as he was concerned his son would be scared seeing his father change into a green creature.
Trivia: Executive Producer Kenneth Johnson wanted to have the Hulk's skin color be red instead of green. His explanation was that red represented anger and green represented jealousy. When telling Stan Lee, creator of The Incredible Hulk about this, Stan Lee said that the Hulk's skin color was green and had to stay green.
Trivia: This is the only episode in which Bill Bixby makes no appearance. This is due to scheduling conflicts while going through a divorce with his wife Brenda Benet. When Jack calls out to David and he is running away, the person that is running is Bill Bixby's stunt double.
Trivia: The make-up process used to transform Lou Ferrigno into The Incredible Hulk took three hours.
Trivia: Arnold Schwarzenegger auditioned for the role of The Incredible Hulk, but was turned down because the producers felt he wasn't tall enough.
Trivia: When Banner is notified of the arrival of the State Trooper and McGee, the voice of "Scotty" over the intercom in the Southwest Lab is that of the writer/director Kenneth Johnson.
Answer: The Hulk is accused of killing Dr. David Banner and Dr. Elenia Marks. After the lab explodes, McGee sees the Hulk emerge carrying the body of Dr. Marks, so he assumed the creature is guilty. It was McGee who caused the explosion. After following the trail of evidence of the Hulk to the lab, he hides when David and Elania arrive. In a darkened storage closet, he knocks over a bottle of flammable liquid. He confronts them, then is forced to leave by Banner, who says, "Don't make me angry, you wouldn't like me when I'm angry." When Banner reenters the lab, it explodes, caused by the Hulk when it went on a rampage trashing the lab, causing many electrical systems to catch fire, thus igniting the flammable liquid.
The Hulk didn't cause the explosion. The liquid mixed with another chemical. While David and Jack were both outside, Elaina heard a sizzling noise, and when she saw smoke coming from the closet Jack was found hiding in, she called out to David. That's when the explosion happened.