Take another look at the sentence:
Digging fingernails into his palms, sweatiness and nervousness about the
speech were what Jerry experienced.
Digging fingernails into his palms, a participle phrase, is right next to sweatiness and nervousness, illogical targets. Jerry, the logical target who has the fingers, is too far away. Before you continue, review the rules for misplaced and dangling modifiers.
Go back to the sentence to try again.