Visible crew/equipment: When the gang break into the house at the beginning we see Shaggy playing with an old record player. It suddenly turns on with a bang, and if you look quickly when the camera returns to Shaggy, you can see a hand on the left side of the screen (with what looks like the remote to turn the record player on) quickly pull out of view off screen.
Visible crew/equipment: When Fred and Daphne are held by the Tar Monster, you can see a crew member hiding in the background.
Answer: The jumper cables "conducted" the 10,000 Volt Ghost into the Black Knight, causing them both to explode.
Sierra1 ★