Aside from the tornado that is referenced in the title, there is a second, figurative twister. Earlier in the series, Angela refers to her dad as a Texas Twister to warn Hodgins that he is to be taken seriously. The Texas Twister returns with a twist of his own- that he can get his sleep-resistant grandson to snooze to loud music, much to the relief and shock of Jack and Angela.
Charlie Weber who plays Nolan, like David Boreanaz, also starred in Buffy the Vampire Slayer
When Mr. Fisher explains the way debris moves in a tornado (and the manner in which it would strike the victim), he compares it to a shotput. Strictly speaking, a discus would be a better comparison.