The correct sentence that displays subject-verb agreement is:
The people in the audience stand as the show ends.
The other sentences have subject-verb agreement errors. Here’s the breakdown:
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"The dialogue spoken by the actors make the crowd roar with laughter."
- Correction: "The dialogue" (singular) should be followed by "makes" (not "make").
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"The helpers working behind the stage comes out, too!"
- Correction: "The helpers" (plural) should be followed by "come" (not "comes").
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"The actors in the play returns to take another bow."
- Correction: "The actors" (plural) should be followed by "return" (not "returns").