During some episodes, the closed captioning text (the writing which appears at the bottom of the screen for people who are hearing impaired and/or have a CC decoder) displays a line or two which is not actually said, and sometimes displays text, indicating a sound was made in the scene by someone or something, but the sound never really happened.

Also, rare but evident, the rate at which the text is displayed can start lagging up to 10 seconds behind when it really was said, rather than being displayed right when the actors say their lines which is how closed captioning is supposed to be displayed (unless it's a live event). Even more rare (but I've seen it) is where the text is displayed up to 5 seconds BEFORE an actor says a line.

I have a knack for pointing out uninteresting stuff, so don't think I'm weird for noticing this. But I use closed captioning, yet I'm not completely deaf and can still hear the TV (to a limited capacity), and it's quite obvious to me.