Quote 1
CASCA
If the tag-rag people did not
clap him and hiss him, according as he pleased and
displeased them, as they use to do the players in the
theater, I am no true man.
[...]
Marry, before he fell down, when he perceived
the common herd was glad he refused the crown,
he plucked me ope his doublet and offered them his
throat to cut. An I had been a man of any occupation,
if I would not have taken him at a word, I
would I might go to hell among the rogues. And so
he fell. When he came to himself again, he said if he
had done or said any thing amiss, he desired their
worships to think it was his infirmity. (1.2.269-272; 274-282)
Casca knows that Caesar's dramatic refusal of the crown and fainting spell are just cheap tricks used to curry favor with the "hoot[ing]" and "clap[ing]" crowd. Casca also describes Caesar's adoring crowd as though they are an audience watching a performance at an Elizabethan playhouse, which suggests that political leaders like Julius Caesar are like actors on a very public stage. Check out "Themes: Art and Culture" if you want to know more about this.
We're also interested in Julius Caesar's dramatic fainting spell. We're not sure whether he really swooned or faked the whole thing, but for someone who's supposed to be such a threat to Roman freedom, Caesar sure does have a lot medical problems, don't you think (epilepsy, deafness in one ear, etc.)?
Quote 2
[...] I could tell you more
news too: Marullus and Flavius, for pulling scarves
off Caesar's images, are put to silence. Fare you
well. There was more foolery yet, if I could
remember it. (1.2.295-299)
Earlier we suggested that Caesar's problem is that he might <em>become</em> a tyrant if he gains more power. Here, however, the play suggests that he's already behaving like one. When Casca says that Murellus and Flavius have been "put to silence" for covering up pictures of Caesar during the Feast of Lupercal, we're left to wonder whether this means that Caesar had them put to death.
Quote 3
CASCA
Men all in fire walk up and down the streets.
And yesterday the bird of night did sit
Even at noonday upon the market-place,
Hooting and shrieking. When these prodigies
Do so conjointly meet, let not men say
"These are their reasons, they are natural,"
For, I believe, they are portentous things
Unto the climate that they point upon. (1.3.25-32)
Uh oh. Crazy weather and strange bird behavior are never good signs in a Shakespeare play. Casca's observation about these "portentous things" reminds us of <em>Macbeth</em>, where nasty storms and animals gone wild also signal political turmoil and the murder of an important leader.