There are two main ironies in the crowd's reaction to Brutus's speech. First, Brutus explains to the crowd that the only reason he killed Caesar was that Caesar was too ambitious. Brutus says he participated in murdering Caesar in order to keep from getting too much power. Brutus loved Caesar as a friend, but he loved Rome more. Therefore, he put the need for Rome to be protected from a would-be tyrant ahead of his personal love for his friend.
The first irony is that though he Brutus has explained to the crowd that he assassinated Caesar to protect Rome from a leader with too much power, the crowd's response is to want to give Brutus more power. For example, the fourth plebeian says:
"Caesar’s better partsShall be crowned in Brutus!"
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