One thing you can easily do is see what they say about one topic when one person they hold favorable does something. Then see what they say when their enemy does the same thing. For example, Paul Joseph Watson's video on Jerusalem being recognized as Israel's capitol.
You can see Bill Clinton, George W. Bush, and Barack Obama supporting this notion with much applause and support from the mainstream media. Then when Trump does this, instant backlash! Why?
You can see it when one senator is merely accused of being a child molestor, and yet hundreds of stories of this stuff going on in hollywood and academic environments gets swept under the rug. How about the manipulation of the Rodney King videos where the media played the clip of a black man being tasered and pummeled by a bunch of white cops, and conveniently left out the part where he attacked them and overpowered like four of them before that.
The rank hypocrisy and deception is EVERYWHERE if you look. So what you do is identify those lies and then hopefully a rational person would think: "OK, they've lied about A, B, C, D, E, F ... and taken opposite positions for no apparent reasons. I have zero reason to believe anything else they say."