What are at least two ways in which Iago manipulates and distorts truth for his own purposes in II.iii?

Iago gets Cassio to drink, knowing that he cannot hold his liquor. Iago also tries to coax Cassio's feelings about Desdemona, and make her seem tempting to him; but his intentions are innocent and friendly, so this approach fails. Once Cassio is drunk, Iago sends Roderigo to argue with Cassio thus setting up Cassio's downfall. That's some major manipulating!