There are several public speaking tricks that preachers use to establish credibility. I am hesitant to use the word tricks because the message they are conveying may be otherwise truthful or helpful, but let me present my opinion and then you may form your own conclusions.
Knowledge of original scripture – “The original Greek says… .” The preacher is using a Greek translation Bible. All such translations were done by men of the modern age. If you trust in your KJV this is totally unnecessary and a hit at faith in the complete accuracy of the Holy Spirit’s work in the King James Version Holy Bible.
Knowledge of Multiple Translations – “Other translations put it… .” The preacher is trying to establish mastery over the subject greater than your own. It is very similar to a preacher exhibiting special knowledge of the Greek or Hebrew supposedly acquired through years of study.
Comparison of one’s life to a Holy figure in the Bible. – “As Noah preached righteousness so do I.” As Moses came through all his tribulations, so did I.” Most preachers don’t compare themselves directly to Jesus, perhaps that is God’s work. This may seem innocent enough, but when you hear these comparisons the speaker is hoping to borrow some Holiness. Something I find even more disturbing is criticism of the Holy men of the Bible. The implication may be the speaker is better, smarter, or more faithful.
Direct communications from God – “God said…”, “God told me…”, “God put it on my heart…”. I am leary and extremely doubtful of preachers who make this claim. God can of course talk to people today, but many of television preachers make such claims. I think I myself would need to be 100% sure. We often answer our own questions and put the answer we want to hear on our own hearts.
Closeness to the Lord – Preacher’s that use the phrase My God or Oh my God. I’m guessing this is done to show closeness to the Lord. We’re close so I can say it. To me it sounds like taking the name of the Lord God in vain, as it is in most cases when the layman says it.
Better are the preachers that stick to the word and demonstrate knowledge of it.