In this answer, I noticed a math bug that looks like an interaction between the parser and the TeX system. When you have a word that starts with math and then has italics or bold later, the italics or bold is formatted correctly in the preview, but not formatted correctly in the final output of the answer.
For example, if you type
$x$-**word**, what you get in the preview is the letter $x$ followed by word in bold, as desired. However, in the final output you get $x$ followed by *word* in italics, not bold, with visible asterisks.
Similar problems happen if you enter
$x$-*word*. In that case you don't get any italics in the final output, just two visible asterisks.
I need to point out that putting the bold in front, like
**$x$-word** isn't a solution, because that makes the symbol $x$ bold. There are cases in mathematics where the bold actually has a semantic value, and even when it doesn't the standard convention is not to put math in a bold font.
Also, I hit another difference between the preview display and the final display when editing the previous paragraph: if you remove the second backslash and compare preview to final output you will see it.