Like when Iago gets Cassio to talk about Bianca so that Othello thinks Cassio is talking about Desdemona.
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Answered by Aslan
Yes, Cassio is repeatedly set up by Iago. Whether its Roderigo picking a fight with him for no real reason or (Cassio) talking about Bianca while Othello listens in, poor Cassio remains largely clueless for much of the play.